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Photo: Wernerluis, CC BY-SA 4.0 via Wikimedia Commons
Visit the black glacier (ventisquero negro), see the Cerro Tronador and a waterfall over an overhanging cliff named Saltillo de las Nalcas, near the village of Pampa Linda. The busride takes about two hours, and costs AR$90 return or AR$45 one-way (Transitando, 20 de Febrero 300, Bariloche). There is an additional entrance fee to the national park of AR$50 (foreigners). With this bus, you have to hike the last 7 km to the glacier, which is a beautiful experience as there is a hiking trail and the road shows amazing landscape. Some tourist buses take you right to the sights. Near the lookout there is confiteria which sells overpriced food although location is remote and the place astonishing.
Tronador is an extinct stratovolcano in the southern Andes, located along the border between Argentina and Chile, near the Argentine city of Bariloche. The mountain was named Tronador by locals in reference to the sound of falling seracs. With an altitude of 3,470 metres (11,380 ft), Tronador stands more than 1,000 m above nearby mountains in the Andean massif, making it a popular mountaineering destination. Located inside two national parks, Nahuel Huapi in Argentina and Vicente Pérez Rosales in Chile, Tronador hosts a total of eight glaciers, which are currently retreating due to warming of the upper troposphere.
© OpenStreetMap contributors
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.
Nice 3 km hike starting close to the Lao Lao golf course. Beautiful views to Lago Moreno.
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).
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.
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.