Zero G fighting would be class!
My top 10..
Ones I actually do:
1. Downhill mountain biking
2. Kickboxing
Ones I that I don't do, but sound cool to me
3. Base jumping
4. Muay Thai
5. Motocross
6. Archery
7. Football (I am scarred for life mentally after being continually taunted while playing football in school. But I like it nonetheless.)
8. Rugby (Screw being a slightly built female!!!!!)
9. Gymnastics (I could probably actually be reasonably non-crap at gymnastics, I'm hyper-mobile)
10. Snowboarding
Shit, I was gonna include BMX and muay thai kickboxing, but I'm only allowed 10.