Find a seat, chat with some of the locals and enjoy the hustle and bustle of Praca da Apoteose. It's a nice spot to take some time out from sightseeing.
To visit this modern public area, find your way to Cidade Nova Rio de Janeiro. There are lots of other things to see and do in the area, like Christ the Redeemer, Sugar Loaf Mountain, and Maracanã Stadium.