Tijuana
From San Diego I made a day trip to Tijuana in Mexico. Tijuana's main industry is the hordes of American tourists who come across the border in search of cheap watches and leather belts, tacos, tequila, silly hats and sleaze. I've never seen so many stalls and duty-free shops crammed into such a small area. There are also a huge number of pharmacies - a lot of Americans come here to get cheap medicines that would cost them a fortune back home. And the place is even more full of enthusiastic salesmen than Nadi (although at least here people will leave you alone if you shake your head and walk off, unlike in Nadi where some of them will harass you all the way down the street). On almost every street corner there is a man with a donkey and a collection of brightly-coloured Mexican hats trying to persuade American families to have their kids' photos taken. Behind the colourful shop fronts and tequila bars of Avenida Revolución (the main street) you get glimpses of hills covered in awful-looking Mexican slum housing, and beyond that, barren desert.
Phoenix
Armed with my cheap 21-day coach pass, I embarked upon a mad dash around the United States trying to see as many places as I could before returning home. It's a big country, so I spent a lot of my trip just sitting on coaches watching the desert roll past. However, I didn't much mind this, because it gave me a chance to relax and catch up on some much-needed sleep, and because many of the desert landscapes are beautiful. They are also surprisingly varied - no two patches of desert are the same. First there was California, with very barren desert (nothing but dead brown grass) and steep rocky mountains, some of which had their jagged tops dusted with snow. Across the Colorado River into Arizona, the state's famous cacti began to appear. The tall green saguaro cacti dotted the desert like demented telegraph poles, and in some places there was also a wide variety of other cactus species - prickly pears, branching antler-shaped ones, fluffy ones, stumpy ones and others. Huge birds of prey soared overhead. Back along the Colorado River, as I crossed from Arizona into Nevada, the colours were fantastic, with turquoise blue skies, and turquoise blue water and the red desert in between. In one town along the river there is an authentic 'London Bridge' - a bridge demolished in London in the 19th century and bought more recently by an American millionaire who reconstructed it piece by piece as a tourist attraction in the Arizona desert. In Nevada there are low ranges of hills, interspersed with very flat, barren patches of desert; some of these are used for speedway racing, and others contin Area 51-type military bases. Crossing into Utah, there are spectacular ridges and canyons, and further into the state, the road climbs into the Rocky Mountains (I could feel my ears popping from the altitude). The landscape is still dry and barren, but here it's cold - with dry yellow grass in the valleys and snow on the mountains, dotted in places with evergreen trees and bushes.

A Greyhound bus making a rest stop in outback California
From San Diego, I had intended to travel directly to Las Vegas. However, the bus I'd planned to catch was full (reserving seats ahead isn't possible here) so I jumped on a different bus and ended up in Phoenix, Arizona.
Phoenix is a typical desert city, with shiny or pale-coloured buildings to reflect the heat of the sun - even at the time of my visit, in 'winter', the daytime temperature was 25°C (77°F) - and palm trees lining the boulevards. In the distance there are ridges of mountains, but the city itself is built on a wide expanse of flat land. With this great open space available, the city sprawls on a colossal scale. Phoenix isn't a bad place, but it didn't seem particularly interesting, and (as in many American cities) it's virtually impossible to get around without a car. So the next morning I got the bus to Las Vegas, Nevada.
Las Vegas
I arrived in Las Vegas late in the afternoon and began an amazing night out - walking down Las Vegas Boulevard ('the Strip') and exploring the casinos along it. I felt like I was in a world of giants - the casino buildings are colossal, and from a distance they stand out along the city skyline. The thirty or so 'mega casinos', lined up next to one another, yet stretch for over three miles (5 km). Nothing in movies or pictures can prepare you for the size, glamour and brightness of Las Vegas. There aren't just millions of flashing lights, there must be billions. It's as though somebody has taken an entire city and turned it into Disneyland.
Of course, there are also many things in the city that are nasty, sleazy, gaudy, ugly and tacky. Amongst the casinos are 'adult entertainment' venues, cheap instant wedding 'chapels', pawn shops to help gambling addicts pay for their habit, and billboards advertising bankruptcy lawyers for those who are unable to do so. But the casinos themselves are luxurious and are kept spotlessly clean. I'm not old enough, rich enough or stupid enough to gamble, but there's far more to the casinos than slot machines and gaming tables, and to my surprise I found that all of them seem happy to let scruffy underage teenagers wander about freely inside.
In addition to gambling attractions, the big casinos contain shopping malls, restaurants and coffee shops (nearly every one has its own McDonald's and Starbucks), hotel facilities, amusement arcades, live music, shows and much more. Several of them even contain rollercoaster rides, and at least two have their own amusement parks inside. To get to all these facilities you have to wander into the disorientating depths of the buildings, where there are no windows and no signs to the exit, just endless rooms and corridors full of attractions and slot machines. Inside one vast casino - the Roman-themed Caesar's Palace - I must have walked literally a mile in search of the exit.
The decoration inside the newer casinos is fantastic, with most of them built around some sort of theme. The Venetian includes a recreated Venice street with its own canal inside (you can even take boat rides along it). Outside the Bellagio, huge fountains dance to the sound of opera music. Pirate ships stage a pretend sea battle in an artifical lake outside the Treasure Island casino. The Mirage is home to an artificial rainforest, live dolphin pool and real white tigers; a fake volcano outside erupts spectacularly every fifteen minutes. Luxor is an Egyptian pyramid crowned by a beam of white light that shoots no less than ten miles (16 km) into the sky. The Paris casino includes a half-size replica of the Eiffel Tower. Possibly the most impressive casino is the Stratosphere, whose main attraction is a 300 metre (1000 ft) tower, about the size and shape of Auckland's Sky Tower. In New Zealand this is a major national landmark, but in Las Vegas it is nothing more than another gimmick to draw in the gamblers. Standing on observation deck on top in the evening was a surreal experience - the desert air was warm and perfectly still, with no breeze whatsoever, even high above the ground. Las Vegas at night must be one of the most colourful cities on Earth. Most incredibly of all, perched right on top of the observation deck of the Sky Tower is a small rollercoaster - the world's highest. The ride itself is tame, but there's something inescapably scary about being thrown around even the slightest bit when you can see the city spread out a fifth of a mile below you.
After a night exploring the casinos I returned to the coach station, exhausted. I then got straight on a bus at 5 a.m. to Salt Lake City, Utah.
Salt Lake City
The contrast between Salt Lake City and Las Vegas was unbelievable. Salt Lake City is surrounded by high snow-covered mountains (although the snow in the city itself has thawed and the temperature was surprisingly mild). The city has a laid-back atmosphere and a very old-fashioned look and feel, with elaborate stone and brick buildings and trams running up and down the streets. On a clear blue evening, with the full moon reflecting off the snowy mountains, it is a very beautiful place. However, it was hard to get used to the ugly sight of bare leafless trees for the first time in a year.
Salt Lake City is the international centre of the Mormon church, and the city is a very religious place. The hostel I stayed at has strict rules on drinking and swearing, and a copy of the Book of Mormon in each room. I went to the Mormon temple in the city centre and chatted to some of the Mormon volunteers and missionaries from all over the world who wander around outside the temple buildings telling visitors about the place and about their faith. I was shown around the various buildings - some of which are architecturally very impressive - by two very enthusiastic volunteers, one from Washington and the other from Pakistan.
Salt Lake City is a strange place. In short, it doesn't feel like America. It's not just the appearance of the city (which made me feel as if I was back in Europe), it's also the atmosphere: there is so little glamour and commercialism there. I had expected Salt Lake City to be full of hype from the Winter Olympics that were held here just a few weeks ago, yet it wasn't. Wandering around the city, I would scarcely have known that the event had ever happened.
From Salt Lake City I went up to Alta, one of the famous skiing resorts in Utah's Wasatch Mountains, travelling by bus up what one old skier described to me as the steepest, and also officially the most avalanche-prone, section of highway in the whole United States. My ears certainly popped as we ascended to 2600 metres (8500 ft) above sea level. The pine forested valley of Alta is deep in snow, and very beautiful. Unfortunately, apart from one fleece I have no winter clothes whatsoever, and the weather report up there said it was -7°C (19°F). A day and a half earlier, I had been enjoying 25°C (77°F) temperatures in Las Vegas. I wandered around in the snow for a while, going numb with cold, then got the bus back down.
That evening I caught the overnight coach back down to the coast, to San Francisco. It was a long journey but a beautiful one, even at night. First the bus passed the great Salt Lake itself, so vast that it was like being by the sea. The road runs for tens of miles along a perfectly straight, artificial strip of land that cuts across the swampy margins of the lake, where in some places huge mounds of extracted salt lie ready to be carted away. As I approached the lake at sunset, the scenery was positively Arctic-looking, with yellow tundra-like grasslands and snow-covered mountains in the background.
San Francisco
As night fell the bus crossed the border into Nevada (the Nevada state border is easy to recognise because there always seems to be a glittering casino just beside it). It then travelled for several hours through empty, black desert. Passing into California, the road crossed the Sierra Nevada mountains, where pine forests were silhouetted magically against the full moon. By morning the bus had descended into the Central Valley - California's agricultural and industrial heartland - and passed through its state capital, Sacramento. From there it was a short trip down to the coast, and San Francisco.
The thing I found most unusual about San Francisco was how hilly it is. Most city centres are at least reasonably flat, but in San Francisco the streets go right up and down some remarkably steep slopes. The city's historic cable cars - old fashioned wooden tram cars - seem to run easily up and down even the steepest of the hills.
I walked across the famous Golden Gate Bridge, which is so long that even at a fast pace it took me half an hour to cross. Unfortunately a thick, cold mist had descended on the Bay, and when I stood in the middle of the bridge, all I could see was swirling whiteness. I couldn't even see the two pylons holding up the suspension bridge, let alone the shore. Down below in the gloom, ghostly ships blasted on their foghorns. It was a spooky experience - like being on a piece of roadway floating ethereally in the clouds, seemingly unsupported by anything.
From San Francisco, my trip continued northwards into Oregon (through about twelve hours of solid pine forests). I spent Easter in Portland, an attractive city surrounded by mountains and forests, then headed onwards to Seattle.
April
Seattle
Seattle has a futuristic feel to it, with bustling freeways snaking their way through and around the shining skyscrapers of the city centre. The Pacific Northwest has a reputation for wet weather, but when I arrived in Seattle the sun was shining, and the place looked very pretty, with the sky, the waters of Puget Sound and the glass buildings all coloured different shades of blue.
Near Seattle I went on a tour of the factory at which Boeing makes its 747 aircraft. The most impressive thing about this was the size of the building, which is officially the biggest in the world (by volume) - Boeing claims that the whole of Disneyland (including car parking space) could be fitted comfortably inside. Tour groups are taken to an observation platform from which they can see rows of jumbo jets in various stages of assembly. I have to admit that I was a little less happy about flying home in one of those aircraft after the factory tour. Lined up down in the factory, the 747s look a bit too much like tin cans with wings.
The only visible impression that has been left on the city by Seattle's other famous company, Microsoft, is the hideous Experience Music Project, a museum of rock 'n' roll memorabilia built by Microsoft's co-founder Paul Allen. Imagine a load of colourful jelly sweets that have got stuck together in someone's pocket and you'll get a good picture of what the building looks like.
Banff
From Seattle I crossed the border into Canada, where the flags are all flying at half mast out of respect for the Queen Mother [who died a few days previously]. I like Canada much better than the USA: it's wilder, more picturesque, cleaner, friendlier, and the shops here sell salt and vinegar crisps.
I decided to wait until next week to explore Vancouver, and instead got a bus eastwards into the Rocky Mountains, along the famous Trans-Canadian Highway. I got off the bus in Banff, Alberta, a small mountain town about a mile above sea level. The journey there from Vancouver lasted fourteen hours but the scenery along the way was amazing - snow-covered peaks, icicle-draped cliffs, majestic forests, and huge elk by the roadside.
Being in Banff it felt like Christmas (the proper, cold Christmas that I never got in Vanuatu). The place was thick with snow and prettily illuminated at night with sparkly lights, and with lots of other tourists around (I'm sharing a dorm with another British gap year teenager) there was a real holiday atmosphere. I loved it.
I climbed nearby Sulphur Mountain - a two hour trek up an almost-deserted forest path adorned with ominous looking signs warning that "grizzly bears may attack without warning". I think the bears were still hibernating, but the forest is home to thousands of tiny red squirrels that dash madly about, squeaking and chirping at one another. The view from the top of the mountain, across the icy mountain ranges, was breathtaking. This time the cold was surprisingly bearable, although the thin air left me breathless as I was climbing. Fortunately, people who make the effort to walk up the mountain are allowed to ride the gondola back down for free.

Banff, Alberta
I had a strange experience as I was walking down to the bus stop the next day. I was walking past a road named "Moose Street", I glanced down it, and - sure enough, there were two great hairy beasts with huge antlers standing in the road. Upon closer inspection they weren't moose, they were elk (the deer-like North American kind), but seeing them in the town centre was weird nonetheless.
Calgary
After leaving Banff I visited Calgary and Edmonton in Alberta, before getting a bus for 17 hours back across the Rockies to the Pacific coast. Calgary and Edmonton both lie on flat, rolling prairies, but the weather there is even worse than in the mountains. When I arrived in Calgary, in the middle of the day, it was minus 3°C (27°F). Snow was lying deep in the streets, and the tops of the buildings steamed in the freezing air. Fortunately the people of Calgary have come up with an ingenious way of getting around the city without braving the cold: most of the malls, hotels and office blocks in the city centre are linked by a network of indoor walkways that cross over the top of the streets. I walked right around the city centre without ever going outdoors, and got to see the insides of all the city buildings that normally I would just have passed by.
Edmonton
Edmonton, whose city centre is attractively situated on top of a steep bank formed by the valley of the nearly-frozen North Saskatchewan River, doesn't have such a system of walkways, but it does boast the world's largest shopping mall, with over 800 stores. As well as shops the place contains amusements, cinemas, a leisure centre, an ice rink, and even a pool of live dolphins in the middle of one of the open halls.
Vancouver
From there I returned to Vancouver, and prepared to fly home. In Vancouver the sun was shining, and at 14°C (57°F) the temperature felt positively tropical compared with Alberta. I spent the afternoon walking along the waterfront, going right around the peninsula on which downtown Vancouver is built, a large amount of which consists of scenic, forested parkland. This is one of the prettiest cities I've seen - the majority of the skyscrapers are shiny and blue (reflecting the water and the sky), the coastline is dotted with small harbours and beaches, and there are snow-covered mountains in the distance.
Epilogue
On 11 April, I finally returned to Scotland. The next day my life seemed completely back to normal: sitting in Gairloch reading magazines, e-mailing friends, and relaxing with my family. I didn't feel particularly tired or jetlagged, in spite of the fact that I'd crossed eight time zones coming from Vancouver, and the fact that out of four nights I spent one on a plane, one on a train and one on a bus.
I amused myself on the plane by flicking through my diary and adding up the following statistics: in 223 days I'd visited 9 countries, 7 Australian states and territories, 6 US states and 2 Canadian provinces; taken 23 flights (totalling 75 hours), 42 inter-city coaches (totalling 257 hours), 136 local buses or trucks, 24 trains or trams and 52 boat trips; spent nights in 51 different places (not counting nights spent on trains, planes and buses); changed time zones on 16 occasions (with differences adding up to 53 hours); drunk 78 shells of kava; climbed 13 mountains; visited 22 islands; and (not forgetting the reason I went) taught 69 lessons.
The amount of money that I'd spent, I didn't dare add up. (Fortunately, a lucrative part-time job with a computer magazine and two years of living in the shopping-mall-free isolation of the west Highlands had left me with substantial savings to draw upon.) My trip was worth every penny, every vatu, and every cent (Australian, New Zealand, Fijian, American and Canadian) that I'd spent.
Upon my return, I found that the Highlands hadn't changed at all (apart from the fact that my parents' house now had proper sewerage instead of a septic tank). It was still raining.