You'll find good caipirinhas at Astor, overlooking Ipanema beach. Also good at Comidaria (Leblon) and Aconchego Carioca, both from the same owner. Latter is near Maracana stadium and worth combining a lunch there with a tour of the stadium. Some of the best food in Rio.

Definitely reccommend Rubayiat for steak and great scenery. Sushi Leblon has decent sushi and great vibe. Lots of bars on Sushi Leblon's street (Dias Ferreira). Rio bar scene is generally disappointing for foreigners (mostly sitting in groups at rundown places, little chance for mingling). But try Belmonte and Brewteco on Dias Ferreira, Bar Urca for sundowners, and very traditional (yet rundown) Pavao Azul in Copacabana, with great food (lunch only, no cards).