National Seashore Located Mississippi and Florida. Gulf Islands NS consists of eleven separate units stretching along 150 miles from West Ship Island in Mississippi to the eastern tip of Santa Rosa Island in Florida. There are sparkling blue waters, magnificent snowy-white beaches, fertile coastal marshes, and dense maritime forests. Also in the seashore are prehistoric shell mounds and fortifications dating from the 1820s up to the 1940s. Nature, history, and recreational opportunities abound in this national treasure The park is open year-round, although operating hours vary seasonally and from unit to unit Gulf Islands National Seashore
Padre Island National Seashore Located near Corpus Christi, TX. Padre Island National Seashore encompasses 133,000 acres of America’s vanishing barrier islands. It is the longest remaining undeveloped barrier island in the world. In addition to a wide variety of flora and fauna, the island also provides recreational opportunities for everyone to feel the wind in their faces and the surf on their feet. Pets are permitted throughout the park, except on the visitor center deck. All pets must be on a leash. All camping is first-come, first-served. No reservations are accepted. National Park Guide
National Park Service -- http://www.nps.gov/