I have never..... - But would like to......

[Arthur Dent]

My list is way too fuckin' long.

Scuba diving
Jet Ski
Water skiing
Rock climbing outdoors (done indoors and love it)
then repel down the side of a cliff
Fly a helicopter
Take a course on stunt car driving (there's one in Florida)
Drive a speedboat at top speed.
Go to a shooting range and try a few dozen guns out (there's a place otuside Vegas that does that. Full automatic machine guns, shotguns, etc.)
Travel all over the world

And that's just the beginning.