My kids loved POR's Old Man Island.
The Clown pool @ BW is very nice with the rollercoaster inspired slide (once you get past the creepy clown, it's not so bad - LOL) But this pool's best feature IMHO is Leaping Libations (for the adults in the crowd of course)
We have yet to try WL, but I suspect its pool is high on the list also.
OKW's sand castle slide & pool with a bridge was nice, but it was too long of a walk to get to (we had no car and wouldn't want to drive to the pool even if we did) and it took forever to get a bus from it back to the room.