Here's some thoughts:
jobs that get the adrenalin pumping:
fire fighting, ambulance work, police work, jet piolot,
freelance writer, commercial artist, television, etc.
"on call" work, consulting, entrepeneural (this could
fit in all 3 of these categories...), etc.
Maybe I'll think of more later...(you can e-mail
me with ideas if you have them and I'll put them up!)