A few years ago I did a tandem jump from 18,000 feet. Those 90 seconds of freefall and 5 minute parachute down to earth were WELL worth the long drive and jump fee. If you haven’t done it, do it. You won’t regret it (and if you’re in the California Bay Area, I recommend “Skydive Hollister,” the highest commercial tandem jump in the U.S.A. (at least it was when I went)).