Midway between Corona del Mar and Laguna, stretching along both sides of PCH, Crystal Cove State Park is a favorite of local beachgoers and wilderness trekkers. It encompasses a 3½-mi stretch of unspoiled beach and has some of the best tide-pooling in Southern California; you can see starfish, crabs, and other sea creatures among the rocks. The park's 2,400 acres of backcountry are ideal for hiking, horseback riding, and mountain biking, but it's best to stay on trails to preserve the landscape. Docents lead nature walks on most weekend mornings. Parking costs $3.