Swimming beaches, marinas, boat ramps, free campgrounds administered by National Park Service on U.S. side of huge international Amistad Reservoir. From Recreation Area headquarters on U.S. 90 at west edge of Del Rio, obtain information, maps, brochures, and directions to Panther Cave (boat access only), outstanding Indian pictograph site. Hdqtrs. open Mon. - Fri. 8 a.m. - 5 p.m.