Planning a summer road trip with my kids. We'll go from here to Murphy NC in one day - it's 12 hours and we've done this trip way too many times so there's nothing we need to stop for on the way. But from Murphy to Colorado (Denver) I'm looking for kid friendly activities that can break up the drive. We're going the classic route - through Nashville, St. Louis, Kansas City... and I don't want all day zoo type activities. Maybe museums that will take an hour or two - I've already planned the Wizard of Oz Museum in Kansas and the Superman museum in Metropolis. Any other awesome places we shouldn't miss?