I will Never do the Rock Climbing Wall .... I'd probably look like a Spider Monkey, and that just wouldn't be pretty.
I agree with many of the other folks, I'll never remove tips, in fact, I usually add to them, I'll probably never do the Flowrider, however, I DO love Zip Lines, so, I'm good there.
I'll never be in the fray of the T-Shirt Sale (although my wife loves them)
I'll probably never have a Suite, unless it's HUGE and we split it with another couple.... we are totally happy in an Interior or Ocean View.... even a balcony is considered an "extra" that isn't a requirement.