FWIW, I did do the tandem-skydiving right after graduating high school. the tandem skydive was nice because you only had to do 1 hour of a video training, and then your jump harness just clamped onto the harness of a guy who had jumped untold times in his life.
we jumped out of a small airplane at 10,000 feet, free-falling for the 1st mile, pulling the chute at about 5,000 feet. it was pretty sweet, and in retrospect, I probably should have forked over the cash to have it video-taped (but I was a cheap 17-year old at the time!). I was also first out of the plane, so I didn't even have time to get nervous!
Sound quite an awesome experience. I never jump with a parachute, but I used to rock climbing and underwater caving almost every week. Off course the south of Italy was offering more of these opportunity, but sometime I wish I was keep it going over here. There is no comparison for jumping into a blu whirlpool underground and fit into the unknown.