Just got back from a trip to South America and adding some information on skybars there. I got shot down in all the cities except Rio:

1. Rio: Aprazivel was nice and the food was pretty good. There are lots of places where there is no view of the city at all. Ask to be seated on the veranda for best bets. View is partially occluded by trees. Expensive.

2. Foz do Iguazu: The skybar opens at 7:30pm and is not open for lunch. When we were there it was closed due to a roof leak.

3. Montevideo: The Radisson Blu sky bar may be changing owners and is not currently open, according to our concierge after they called the hotel.

4. Buenos Aires: The skybar at the Pulitzer Hotel is best I could find, but it is only open for the summer. It was not open when we tried to go.