I have participated in a few adrenalin experiences, as well as jumping out of a plane with a parachute. I'll need a full day to do some more study before engaging in such daredevil activities. It's a challenge to find the time.
I am terrified of heights, but have actually done parasailing once. It was very fun, and strangely enough once you're in the air it almost feels as if you aren't doing anything at all apart from sitting down. Going up and coming back down was very fun, even for a chicken like me, and the view was beautiful.