I don't have children but when my cousins from France came with their 5 year old I immediately thought of McCormick Railroad Park. I grew up in Phoenix as a child and have memories of it from then but had not been in over 20 years. They really have not only maintained it but made great improvements. Playground or the kids, carousel, train museum and historic trains throughout the park. Rides on the train are only a $1 and the playground is great. There really is something for everyone.