The dense forests, high mountains and glaciers of Tierra del Fuego are a surprise to you arriving from the bleak Patagonian steppes further north. The forested landscape of the National Park surrounds the world's southernmost city, Ushuaia. Here, at the tip of the continent, spring and summer days are long and it's not normally very cold, but it can be windy and wet and you should expect four seasons in one day, every day, and in no particular order...
Your 3 day trek takes you over passes and through the valleys inland from Ushuaia, to beautiful lakes and to the summit of the rarely-visited Mount Tonelli.
There are not many places in the world where you can hike in a virtually unvisited wilderness within just a few kilometres of an international airport and busy port, but this trek in the mountains behind Ushuaia offers you the opportunity to do just that. It is so remote - if you can use that word in this context - that you walk along narrow trails forged by guanacos rather than humans, and many of the spiky mountain peaks in this protected national park are as yet unnamed. Carved through by icy streams, waterfalls and glaciers, mantled by evergreen forests and carpeted with boggy, flower-speckled grassland, and framed by needle-sharp icy peaks, it is a tortured landscape of incredible natural beauty. It's a circuit, and local conditions will dictate if you go up the Andorra valley or climb down it: it's the same amount of climbing either way, of course, and the gradient is similar.
This is not an extreme trek; anyone of good fitness, who is reasonably sure-footed and does not harbour a fear of heights, should be able to manage easily and enjoy the experience.
From Ushuaia, you head inland and travel by road towards the Andorra valley, along a road lined with small homesteads. Start walking up through woodland, sun-dappled if you are lucky, alongside swift streams, crossing makeshift bridges. It is easy walking to start with; you may pause for a snack or lunch on a grassy meadow with views across the valley to the towering build of a snow-smothered and sharply glaciated mountain range, the Cordón Vinciguerra. You emerge above the trees with great mountain views and descend through coarse grassland peppered with lumpy rocks to a sheltered site on the shores of Laguna del Caminante: a perfect place to camp, but without any facilities. If there is time you may want to explore the forest-fringed shoreline of this tranquil, silvery lake. Pitch your tents among the trees for a two night stay; you'll be served a camper's afternoon tea and later, dinner. Retire for the night in a wilderness place undisturbed by the noise of any human activity.