Answer:
I am a precious stone, as clear as a diamond. Though you can walk on water with my power, try to keep me, and I'll vanish in an hour. What am I?
I can be entertaining until you realize some pieces have been lost.
I wiggle and cannot see; sometimes underground and sometimes on a tree. I really don't want to be on a hook and I become a person when combined with “book”.
I help you carry your books.
I let water fall on you while everyone else stays dry.
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?