i didn't know there was any danger inherent in parasailing! they do mean the thing where you have a parachute strapped to you and you get towed behind a boat, right?
i can kinda understand skydiving...i mean, maybe there are enough broken ankles and stuff to blacklist it.
cliff diving? is that jumping from rock cliffs into water (like old rock quarries and stuff? we used to do that all the time in college).
i definitely understand freeclimbing being on the "bad" list.
now, when i say track days, i'm not talking about any sort of timed or competitive event. i'm talking about just open track riding sessions (and/or high-performance riding/driving schools).
i definitely understand motocross! i've been in 4 motorcycle wrecks on the street, and none of them compare to the pain i brought on myself from a bad landing from a double on a motocross track one time! didn't break anything, but took 10 stitches and 10 staples, and my knee was sore as hell for at least a month.