One good excursion in the area is to Lago Escondido and Lago Fagnano (Fagnano Lake). The Pan-American Highway out of Ushuaia goes through deciduous beech forests and past beavers' dams, peat bogs, and glaciers. The lakes have campsites and fishing and are good spots for a picnic or a hike. This can be done on your own or as a seven-hour trip, including lunch, booked through the local travel agencies (around $60USD standard tour, $100USD with lunch and 4X4).
Ushuaia, Tierra del Fuego, 9410, Argentina