I had a car named Tank which was a 1986 Chevy Capris when I was in high school (mid 1990's). My favorite road to drive on was this old back road that's completely straight but has tons of big hills. One late nite I buried the needle - so somewhere upwards of 120mph. It was fun, but only did it once ... I know too many people who've been killed in car crashes.
As for other stuff, I've been repelling (on the side of a busy highway.. WTF?). That was fun, too.