I tend to read a lot. The subjects differ, but I always have about fifty books started. At this moment I'm delving into archaeology and history, but I have plenty of science, philosophy and fantasy books waiting to be read as well. I also occasionally read a humour book to balance everything out.
I also watch things. By this I'm referring to television, movies, etc. I don't actually turn on the TV and just see what's there or anything, but I do occasionally re-watch TV DVDs that I find interesting. My movies are usually of the epic/fantasy variety, my television shows are usually medical or science fiction that don't mind delving into philosophy occasionally (think House or Buffy - yes, I am a dork). I'm also an avid anime fan - the more artistic, the better. Mushi-shi I think is best representative of that.
I also enjoy keeping active. I practice martial arts (tae kwon-do), staff fighting and I occasionally climb rocks. Swimming and hiking are also fun, but I tend to do those less.
Oh, and video games. When I have time.