Get ye to freaking Porto Alegre, it's where absolutely everything in the world goes on, like uh...the World Social Forum, and uhm, yes, other great stuff.
Rio de Janeiro has its Christ the Redemer, Sugar Loaf Mountain, and wonderful beaches (NOT!) BUT, go there and you'll get KILLED! In PoA you'll just get robbed at gun point.
How many of yous are popping in
1,020 wonderful lovely jubbly people have visited me so far