Among your first stops should be Alakush Visitors Center. Here, you'll be able to orient yourself and pick up some great ideas before you begin exploring.
This Ushuaia tourist information center is a good place to begin your day of sightseeing. There's plenty to do and see in the area, like Tierra del Fuego National Park, Lapataia Bay, and Roca Lake. Take your time at Alakush Visitors Center before hitting up these other fine attractions.