"Once a U.S. Army airfield, Crissy Field has undergone an amazing transformation over the past 20years and is now part of the Golden Gate National Recreation Area. A popular spot for dog walkers, bikers, runners, and families, the 1.5-mile promenade that skims the bay draws around 1.2 million visitors each year. The outdoor space on the edge of the Presidio has one of the best views of the Golden Gate Bridge in the city, making it an excellent place for a photo op, too. The waterside path runs between the Marina Green and Fort Point, just under the bridge. Along the way, there are sandy beaches to run around on, picnic tables, barbecue grills, tidal marshes, and low sand dunes. You can also catch a glimpse of some epic wind- and kite-surfing on the water. Drop into the Warming Hut at the west end for coffee, hot chocolate, water, snacks, and San Francisco–themed gifts before continuing on to the end of the trail. Make sure to touch the Hopper's Hands plaque—it's a tradition. You'll understand when you get there."