Mount Tamalpais State Park near Mill Valley is the iconic peak of Marin County, rising above the Golden Gate and San Francisco Bay. Redwood canyons, grassy ridges and ocean views make it one of the most beloved parks in the Bay Area. About 50 miles of trails cover the mountain, offering everything from easy strolls to challenging climbs. Panoramic bay views are spectacular from the summit area, and the Mountain Theater, a natural amphitheater, hosts summer performances. Camping is available for those who want to stay overnight. Entry is $8 per vehicle. Fog is common, so bring layers even on warm days.