Muir Beach

"Just across Highway 101 and over the Golden Gate Bridge, Muir Beach is an easy (but still totally idyllic) day trip from the city. The beach itself is a classic Northern California cove, with tall rocks and green hills on either side and boulders jutting up from the shallows—the surrounding area is home to plenty of wildlife, too. In the colder months, take the long pedestrian trail from the parking lot to the coastal trail and hike along the cliffs, which offer gorgeous views of the beachfront; be sure to pack layers, as winds can get cold. In the warmer months, it's perfect for sunbathing, and there's even a clothing-optional sunbathing and skinny dipping area past the line of rocks on the northernmost end of the beach. Afterwards, grab lunch at the Pelican Inn, a traditional English-style pub in the tiny nearby town."