Waterworld entrance is free with admission to Astroworld. However, the Waterworld section closes at 6 p.m., which is not that great. However, it does have some great rides and is a perfect spot for a family outing. The only things to watch out for are weather and the beverages and food are rather expensive. However, , this is a great place to go, ESPECIALLY with a family. Very family oriented, and you can have fun in the water!
Only thing I didn't like was the lack of cleanliness at the tables and some of the disrespectful lifeguards, but that was all cleared up with a call and complaint to their supervisors. Great place to go, but if you encounter any trouble with employees, the only thing that will set them straight is threat of losing their job, so make sure to call their supervisor to report any problems, if any. Happy swimmings!