If you're in the Dallas/Fort Worth area and have read the reviews about Hurricane Harbor being crowded and dirty, then I highly recommend one of the Hawaiian Falls water parks (there are 4 of them in that area, plus one near Waco). We only went to the one in Mansfield, but I'm assuming the others are similarly organized and managed.
We liked everything about this water park: the selection of water activities, the short and even non-existent lines, the cleanliness, the service, the food, the price. It has rides for all ages, from super fast and scary slides to a kids area, and everything in between, including a large wave pool and long lazy river. Our favorite was the slide where you get to race other people on mats, like those slides they have at the fair where you slide down on burlap sacks. The wave pool didn't have the biggest waves we've seen, but still big enough to body surf 20-30 feet, which was fun.
We liked this water park so much we went there 2 separate days on our 2 week vacation.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.