The tickets can be picked up in advance. You go down to the desk in the mall area and pick which show you want to go to and they give you a carnival type ticket and write how many people on it. You can go anytime during the day that you want to attend. When we were there it was very crowded so if you have time constraints, earlier ticket pick up is better.
Depending on what the evening show is, sometimes the families are picked ahead of time.
When they play the pool games, they can win little prizes like coupon for a free ice cream, or a few arcade tokens, free face painting coupon, etc. When we were there in June, the pool/pool games were extremely crowded and everyone wanted to participate.
The pool games are played at both pools, and the times are alternated. We found the games to be much less crowded at the smaller (think it is called oasis) pool.