We stayed there the Sunday before last. We headed to the pool at 9:30pm. The kids had a blast. The pool sign said that the pool closed at 10:00, but once that time rolled around everyone was still swimming. I asked the lifeguard what time the pool closed. He said it offically closes at midnight but the lifeguards are off duty at 11:00 pm.
BTW the pool was packed at 10:00pm. The pool is pretty cool too!