THIS TEXAS-SIZED sandbox brings out the kid in all of us. Learn about the park at the visitors center with a video game explaining the park’s aquifer and an interactive display called the “Dune-o-matic” where kids can create their own sand dunes. You can rent a disk to surf down the dunes; some tower as high as 70 feet tall. The park also features a huge forest of oak trees that most children would tower over (they’re called shin oaks).