Join a park volunteer on an Ancient Volcanoes Hike in the backcountry of Crystal Cove State Park and explore several of the park’s volcanic features on Sunday, Aug. 28, from 1-3 p.m. Learn about the land/seascape setting 10 million to 11 million years ago, and then head out to observe some volcanic sites in the park. Meet at the Berns Amphitheater (PCH inland at stoplight School-State Park.) $15 day-use fee.