Padre Island National Seashore

"Known for being the "longest stretch of undeveloped barrier island in the world." In addition to lounging on pristine beaches, you can get out on the water via kayak, try windsurfing"

"Renowned as the largest undeveloped barrier island in the world, the drivable hard sand of Texas’s Padre Island sweeps 80 miles from Corpus Christi to Brownsville, free of the resorts and homes strung along the mainland several miles west across the Intracoastal Waterway"

"Endangered Kemp's ridley sea turtles nest in the park and are closely safeguarded. Visit in late summer, and you might be able to take part in a turtle release." Full review

"The world’s longest undeveloped barrier island. This conservation area, stretching around 66 miles...explore this charming stretch of coastline by kayak or canoe, watch sea turtles being released"