Being underwater in the dark terrifies me! Just the thought of it... I might be able to snorkel!
I would sky dive IF I could piggyback on someone. I'm afraid I will panic and won't release the parachute... or it just won't work.
At the parachuting club I went to you have to do ten jumps with a static line which opens your chute for you as soon as you leave the plane, before you are allowed to do a free jump where you have to pull the rip cord.
But you do have a reserve chute with a handle to pull if your main chute does not open.