I'm Brazilian so I get to correct pretty silly stuff:
Brazil is a big place and the climate isn't homogeneous.
People like soccer here and many love it (some are reactionary and fight over games, as always) but it's not as all consuming as some people seem to think.
No, we aren't all extroverts, party animals, social butterflies, whatever, although I do feel the "Overton window" here on social things is more extraverted than in the US/West (and Japan and South Korea) in general.
We don't all listen to samba. While people here most often listen to pagode, sertanejo and Funk (moderately controversial music genre, though not really for substantive reasons) which are generally (keyword, obviously many songs in these genres are serious) lighthearted/for entertainment, we listen to serious or relaxed music too, mainly in rap, because we are normal.
I honestly can't really think of any misconceptions that aren't half-beaten to death about here.