Driving and motorcycling (especially when large amounts of lateral acceleration are involved), working on cars/bikes, flying, skiing, shooting, working out, spending time with friends, listening to music, going out to movies or staying in for them, laying out on the beach or next to the pool, hot showers, ebay, rollercoasters
Lots of rock, alternative, pop. Stone Temple Pilots, Pearl Jam, Guns N Roses, Hoobastank, Linkin Park, Nickelback, Velvet Revolver, Staind, Stabbing Westward, Soundgarden, Chili Peppers, No Doubt, Matchbox 20, Live, Fuel, Fiona Apple, Avril Lavigne
I like pretty much all types of movies. I just like to see the creativity in most anything. It's cool just to escape to someone else's reality for a couple of hours.
I don't watch a lot of TV, but when I do I tend to be afflicted with the tendency to constantly change the channels in search of something better. I'll stop for Mythbusters, South Park, Family Guy, Jay Leno, motorcycle racing.
I've been told I should probably read more. I think the only fiction books I've read since I've been out of school are the first 4 Harry Potter books, and that was a few years ago. I mainly look into books that teach a skill. I've read a bunch of financial books and other self help books.