My favorite sport to play (although I can't play anymore) is softball. I was a pitcher in high school, won awards, was in the paper, nightly news, the whole nine yards. It was pretty cool. I was recruited to play in college, but I pretty much overworked myself to get there, and threw out my arm. Had to get surgery on it a few years ago since I couldn't even carry my own groceries.
My favorite sport to watch is probably tennis. Though I never played it, my mom LOVES to watch it. She watches every tournament and grand slam on the Tennis Channel even. So, I grew up watching the sport and came to enjoy it. There's something nice about everyone having to sit there and be quiet to watch the match that's a nice change of pace compared to other sport events.