Quick ride to the GG Bridge, down the hill to Fort Point, across Crissy Field to the Marina, Fort Mason into Fish Wharf, then to Chinatown for a Won Ton Soup lunch, then through the Stockton Tunnel to the Apple Store, Union Square, and home into the headwind.
15.7 miles/1 hour 54 minutes of riding +/- 925 feet
See the route on google maps.