I snowboard, wakeboard, surf, wakesurf, bmx and (used to) paintball, if that counts as an extreme sport.
I've tried almost every regular sport there is, but they just don't provide the same experience, possibly because you can't really express your creativity through them. The only regular sport I've stuck with is wrestling, possibly because it has a good range for creativity.
This past weekend I met and talked with a few wakeboard pros and got to ride behind $150k Axis and on a 200k+ Ski Natique G23 Boat as Bob Soven (ginger from Wakebrothers) and Dean Smith (Ronix) rode behind to get shots for Transworld and Alliance Wake.