The turnout at Red Rock Spring, just south of Stinson Beach, is packed with 40 or more cars on sunny summer afternoons. Though the trail to beach below, once proclaimed by the Light as the “friendliest nude beach on the North Coast,” begins here, the bigger attraction is the fresh water tumbling from copper pipes across the road.
People gather to fill plastic barrels—some call it water harvesting—while children play in the reeds.…