Fort Worth Aviation Museum
The Fort Worth Aviation Museum is a great place for kids who love planes and helicopters. Inside the museum they have lots of memorabilia with information on the aircraft and the history of aviation with a focus on aviation relating to Fort Worth. Outside they have many types of aircraft and while you aren't supposed to touch most of them they do have a few that you can go inside. The aircraft present great photo ops and the docents are very knowledgeable. If you have any questions or just want general info about the museum just ask and they'll be happy to share!
They periodically have events where you can get in for free or at a discount. Check out their website or Facebook page for any upcoming events.