This place is a parent's and a kid's dream. My kids are grown now, but it sure would have been great to have encountered a museum of this sort when my kids were small. Children can basically be turned loose to touch whatever they want, move things around, see how things work -- just the kind of things parents seem to spend all their time telling their kids not to do in a typical museum.
A toy store for kids is right off the Kids Explore area. We didn't linger here, but it looked as if there were some great things to be had at this store.