Big Bend
Credit: Witold Skrypczak / Getty Images

With more than 800,000 acres, Big Bend is the largest park in Texas, running along the Rio Grande River that forms the boundary between Mexico and the United States. It was established in 1944 and is one of the least-visited parks in the country, despite being home to more than 1,500 species of plants, birds, and mammals. Hiking and backpacking are popular activities in the park, but nothing quite compares to its stargazing. In 2012, the park was named one of the 10 best places on the planet to stargaze by the International Dark-Sky Association because it has some of the darkest skies in the continental U.S. 

Don't Miss: Marfa, Texas, a remote ranching community turned style hub, is a two hour drive northwest of Big Bend and is a must-see if you’re in the area. In recent years, the town has become home to a thriving music scene, fashion-forward boutiques, modern art exhibits and trendy food trucks. Locals recommend playing pool at Lost Horse Saloon before checking into a teepee or RV at the hotel El Cosmico.