Despite the massive size of Texas, the second-largest state in the U.S., we've only got two officially designated National Parks. Big Bend National Park and Guadalupe Mountains National Park, that's the whole list. Big Bend Named A Top 10 Must-Visit National Park in The U.S. According to Travel 2 Next, twelve areas in Texas are managed by the National Park Service, but they're not national parks. Being as big as it is, Big Bend always scores well when it comes to crowds; it's simply impossible to fill it up.