Waterworld is a great place to take the kids on a hot day in hopes of cooling off. Especially since it's been crazy hot this summer! It's also a fun place to go with friends even if you're no longer a kid.
There are quite a few water slides that always get the heart pumping and are great fun. There is also a lazy river (my favorite!) and a wave pool which are both nice places for hanging out in a inner tube with.
Prices are very reasonable too. Be warned though, on hot days lines are long and you may have to fight for a lawn chair.
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