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We recently visited the Mayan Adventure Waterpark in the Chicago area.  It's an indoor waterpark located in the Holiday Inn in Elmhurst, IL.  We got a Day Pass and went for a half-day, but you'll need to call on the day you go to make sure that Day Passes are available. 

This waterpark is just the right size for our 5 & 8-year-old kids.  They just learned how to swim this summer (Yay!), and this was their first time going down a big waterslide.  The waterpark was not crowded (on a Saturday in July), and the staff was friendly & helpful.   

There is a tube slide, a body slide, a lazy river, a basketball area, and a zero-depth playstation with little slides for little ones and a giant dumping bucket.  The hot tub was not open and one of the kiddie slides was closed off the day we visited.  There's a snack station that serves pizza, hot dogs, burgers, etc.  Towels are provided, but the locker room is small and doesn't have showers. 

It's not the newest or fanciest place to go, but we enjoyed it.  The kids had a great time, and we would go again.