The Skokie water park is really fun. Kids as well as adults can have a really good time. The prices are reasonable as well. They have slides and pools for toddlers and even just a regular lap pool.
PROS: Price and Distance
This water park has slides with tubes, as well as a zero depth entry for small kids that has a sprinkler, and a climbing area for bigger kids. There is also a regular lap pool if you just want to swim.4