Took my 3.5 year old here for a 5-year-old's birthday party last weekend. The kids loved it! The rides are perfect for the under-6 set, and the play structure in the back is fantastic fun. I only wish we lived closer because this place is great for a hot summer day or for a birthday party.
The parents seemed to love it here, too, because the kids were entertained and we could actually have adult conversation for about 2 minutes at a time while they were on a ride!