The boys' favorite part, by far, was the kiddie pool. It had several "animals" (all of which squirted water) and two "safari cars" which had slides (which Jonathan loved and Andrew liked for a while), tunnels (which Jonathan loved), and steering wheels (which both boys loved - I think Andrew would have just stayed up there turning the steering wheels all day had we let him).
There was also a wonderful (not water) play area with tunnels, slides, foam balls - think McDonalds Playland on serious steroids. Jonathan and I went in there and played for quite a while when Andrew was (supposed to be) taking his nap. It was fun (even for me - though I wouldn't have had much fun in there without the boy!!!).
We brought all our own food - conveniently, the hotel room had a microwave and a fridge, so we could eat there; we spent a lot of time walking between the room and the waterpark - down the hall, take the elevator one floor (OK, we could have taken the stairs, but Andrew is really slow on the stairs, and besides, if we had taken the stairs, we wouldn't have gotten to have the experience of having Andrew push the emergency phone button in the elevator).
It was a great trip, and we had a wonderful time.