Padre Island National Seashore
Wow Factor: Once called La Isla Blanca (White Island), this 113-mile skinny strip of pale-white sand is the longest undeveloped barrier island in the world.
You'll Love If: You prefer beaches sans miniature golf.
Explore It: Head south as the road transitions to sand to gather ark and coquina shells on your own "private" beach. nps.gov/pais