Children ages 2 to around 5 love Play in Place. It's a great alternative to the park on a hot day. There are costumes to dress up in and several playhouses and stores for pretend play. The only bad part is that parents have to move around with their child if they want to keep an eye on them. There's no way you can see the entire play area at once, due to the way it's set up.
There's nothing there that would excite anyone past kindergarten, however, smaller children seem to really enjoy it. Admission is $6.50 and socks are required.