These almost unlimited coastal access points are what made Kathy Biala move here five years ago. She’s taking me to one of her favorite walking spots on the shore, but before we reach the beach Biala wants to take me on a little detour. We drive past the wastewater treatment plant, then to the regional landfill, and finally to a sand mining plant — a post-apocalyptic looking moonscape where sand from Marina beaches gets packaged for places like Home Depot, golf courses, and concrete manufacturers. The state determined that it was causing some of the worst beach erosion in California.