The Southwinds marina is a nice area within the Amistad National Recreation Area with a boat ramp and camping. The boat ramp is open to the public but the camping options and boat rentals were reserved for military and law enforcement only as of 2013. Users often come from Laughlin Air Force Base, which is located on the eastern edge of Del Rio. U.S. Border Patrol also have access. I’ve never camped here but it’s a nice place.