Just across the Golden Gate Bridge from San Francisco, the Marin Headlands offer shoreline views, crashing surf, and a surprising wildness. Join the parade of cars winding up twisty Conzelman Road to Hawk Hill, but don’t stop there. Drive a bit farther to the beach parking area on your left, and you’ll see signs for the trail to Black Sands Beach. The 0.75-mile hike down (slightly rickety) steps is sure to put the rosy in your cheeks, and the narrow strip of beach is windy, wild, and stunning. Another great spot is the Tennessee Valley Trail, which winds 2.2 miles (one way) past rolling hills toward a secluded beach awash with green and black basalt pebbles.