This beach is sadly not fit for swimming since the bay is polluted. However, the bay hosts many events, it is a popular gathering place and the area around is also great if you want to just stroll around. You can see the Sugarloaf Mountain perfectly from here as well.
Wikipedia https://en.wikipedia.org/wiki/Botafogo
Address Brazil
Coordinates -22°56'43.151" N -43°10'49.798" E