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Photo: Diego Rivera, Argentina., CC BY 2.5 via Wikimedia Commons
In late spring/summer/early autumn there's a trekking trail to the mountain shelter (not as easy as Otto's). It takes about 3 hours to get there and can be quite tiring, but the views from the shelter are impressive. Be sure to bring along water and some fruit to keep your energy. Colonia Suiza, a Swiss-like borough, is nearby.
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Nice 3 km hike starting close to the Lao Lao golf course. Beautiful views to Lago Moreno.
This beautiful 25-km route can be biked or hiked. You can also do it by bus during summer (line 10). If you hike it, take bus 20 towards Llao Llao till "El Muelle". See map above for track.
Beautiful view of the lakes and mountains around—hike it (30 min, departs near the bottom of the lift) or take the ski-lift (AR$8000, ~USD$8). Get in with bus #20, 21, 10 from the center and get off at km 17.8. After the Campanario you can go on with the Circuito Chico during the same day.
Considered by many as the best 1-3 days trekking in Bariloche. When it's cold enough you can skate in the lake near the refuge. When there's not too much snow you can climb the granite "agujas" (needles) near the refuge which have ways for all levels, or head to Lago Jakob. There are two ways to get in and out: the main one is from Villa Cathedral (bus #52, every hour), another (a bit longer) one starts from Los Cohiues and goes along the Gutierrez lake (bus #50).
Skiing
It has the biggest ski centre in South America, with a skiable area of 2 km² (0.77 sq mi), over 100 km (62 miles) of ski runs, and a lift capacity of 22,200 skiers per hour. It is located 19 km (12 miles) from Bariloche. If you enjoy hiking, there is trail to the Frey refugio which takes about 6½ hours (4 up, 2½ down). Look for the trailhead in the far corner of the parking lot.
In the early 1950s, an Austrian scientist named Ronald Richter attempted to build the world's first fusion power plant on an island in a lake in the Andes, the undertaking being known as the Huemul Project. A couple of years and an equivalent of several hundred million US dollars later it came into light that Richter never had got any proof of his design actually functioning in the first place. As the patron of the project, President Juan Perón, was ousted in 1955, Richter was arrested for fraud. Today the ruins of the project can be visited on the island, and the city itself remains a center of Argentinian nuclear research.