My kids went para-sailing while we were in San Diego. My younger son has ALWAYS wanted to do this. My older son only decided at the last minute to do it as well.
We went out with them for the boat ride, which was a blast all by itself. (I was too chicken to go up in the sky...)
So - the son that didn't want to go had the time of his life; the son that has been bugging me for 3 years was scared to death.
Really Fun!