Morton Arboretum, located in Lisle, Illinois, west of Chicago, is the home of a lovely children's garden where kids get to splash through streams, climb acorns, and slide down tree roots.
There are two main areas: a Backyard Discovery Garden and Adventure Woods. The two are linked by a Central Plaza.
Within these main areas are 10 themed gardens. These include a Windmill Garden, Curiosity Garden, a grotto with a secret stream, and my favorite, the Wonder Pond. If you go, look for the American Toad tadpoles in the pond. They're a favorite with kids.
The garden is open year-round from 9:30 AM to 4:00 PM. Admission is $9.00 for kids, and $12.00 for adults.