Sea Rim State Park
Our first stop in Texas was Sea Rim State Park on the southern coast. It's a cute little park that sits on the beach. If you have a small enough rig, you can park right on the sand.
We took long walks on the beach. Max loved the wide-open space to run and play. It was a very picturesque setting. The only drawback, the mosquitoes were crazy at dusk. I still have bite marks on my ankles.