American Football all the way! It's about the only sport I really like, though. I can get into baseball in a small way if I'm watching it with someone who's a fan, but otherwise I don't care two licks about any other sport -- as a spectator, that is.

Participant-wise, I like American football (although I never played in school), volleyball, and bowling. Yes, I know bowling isn't a "real" sport, but I felt like including it anyway.