Def mention it. It's not like they are paying millions to attend their school or providing you with life insurance. ITs a sure way to stick out from the crowd
I would mention it, but don't expect it to work wonders for you. If you could correlate skydiving with your passion for dentistry would be pretty cool, but like you said....It's just a hobby.
Shrug, I mentioned motorcycle riding because I could link it to balance and coordination. Maybe skydiving = remaining calm under pressure? haha 😛 I'm giving up bikes when I move for dental school though. Totally not worth risking my future anymore :-/