The next day I hiked up into the mountains outside Ushuaia, to see the Martial Glacier. I had my first real experience of how quickly Patagonian weather can change - twenty minutes after I set out in bright sunshine, I was struggling through a blizzard. Twenty minutes later it was sunny again. A few miles up the switchback road I reached the bottom of the trail, and set out into the forest. Half an hour up, there was a small cafe at a ski-lift station, and I stopped for a coffee as the blizzard briefly returned. Then, I climbed up to a viewpoint, where there were stunning views of the Beagle Channel and Isla Navarino, under bright sun.
Heavy cloud was soon approaching rapidly, and I left the viewpoint for a quick look at the 'glacier'. I am actually not sure whether I saw it or not - there just seemed to be a lot of snow at the top of the trail, and nothing that looked particularly glacier-like. Everyone I spoke to later who had been there agreed it was pretty rubbish, but it was still worth the trek up there for the views back down to Ushuaia and beyond.
For the next two days I was laid low with a heavy cold, probably the result of my miscalculation in not taking a hat or scarf out with me up to the Martial Glacier. I stayed in the warm hostel quite a lot, but did walk around Ushuaia. It seemed really pleasant and friendly, and my only moment of worry came when there was an anti-Bush demonstration to mark a visit by the US president to Argentina. I very much agreed with the sentiments of the demonstrators, but there were people handing out Argentine flags and I was wearing gloves with Union Jacks on them. In this part of Argentina there are signs by the road declaring that the Falkland Islands belong to Argentina so I thought I'd better hurry on by and not look too British.
Once I'd recovered from my illness, I visited Tierra del Fuego National Park. I was lucky here - the weather was great and it stayed great all day. I walked for a couple of hours along the shores of Lago Roca, reaching the border with Chile. There's a marker that says 'don't go beyond here' but nothing to stop you entering Chile illegally except a vague suspicion that there could be soldiers in the woods. It really emphasises how ridiculously arbitrary national borders are, and I put a foot across before walking back.
I really liked Ushuaia, and Tierra del Fuego, and I would happily have spent much longer there. But my time was not unlimited, and having reached the very bottom of South America, I had just under three months to make it to the Equator. It somehow seemed improbable that I would be able to get there at all from this far flung corner of the continent. There was, though, still much to see in Patagonia, and I bought a bus ticket to Puerto Natales back in Chile, from where I was going to visit one of Patagonia's legendary sights - the Torres del Paine. The bus left at 5.30am the next morning.