$3/child 1 - 16 years old, adults are free.
a good layout--circular area where you can keep an eye out for your kids at all times. Fun, interactive items (spray guns, buckets, trains, etc.), and a nice table/sitting area on the outer circle. Very affordable and great for a hot, humid Midwestern summer day (obviously!).
I want to say the bottom is concrete on the splash pad, which isn't the most ideal bottom when the kids slip. But most of the time, they don't. Not much shady areas in the water area itself, but there's a covered area with picnic tables where the bathrooms are. I also liked that the wristbands were redeemable at Panera Bread for a free kid's meal if you bought an adult meal item and they didn't expire until that fall.
Great splash park just off of Roosevelt Road. The cost is only $3/child but at least last year each wrist band had a coupon for a free children's lunch at Panera (location on Roosevelt Rd). wasn't ever too busy. there is also mini golf, play ground, and outdoor activity area on the same grounds.