I had the chance to visit Bariloche during Feb/March, and one of the places to visit was Cerro Otto
This is famous not only because of the amazing views, but also for the rotating cafeteria.
The gondola that will take you up and down is $110 (around USD20). If you're a trekking fan, you can also go to the top walking, but let me tell you that it is not the easiest thing to do, and besides, you can do some walking once you're up there, as there are several rails to follow and enjoy the views
The restaurant/cafeteria, of course, rotates, 360, so you can be seated in one spot, and will get to see the full picture (is funny when somebody goes to the restroom, for instance, and the come back and can't find you as you are "rotating", haha)
The service is just ok, but found the prices to be pretty good, considering where you are and that they are the only place serving food/beverages)
Besides the trekking rails you can find, there's also an art gallery (not sure I can call it that) where you can see a real replica of Michelangelo's David....but if you don't have the time to check it out, nothing important will be missed.
The one thing that nobody seems to promote is the "Otto Kart", which is like an inflatable tire you'll ride, and go through a 300mts road, going down.....I believe it was like USD10, and you get to do it 3 times...it was soooo much fan!!! If you have the chance, do it, we were a group of 4 and all enjoyed it very much
Now, regarding the views, AMAZING
Last but not least, there's a free bus that will take you town center