You'll fall in love with San Francisco all over again as you follow this hilly loop trail circumnavigating Angel Island. Along the way, savor the panoramic vistas of the Golden Gate Bridge, San Francisco, Alcatraz Island, the East Bay and Marin County. The 10K (slightly long at ~6.5 miles) is a single loop. The Half Marathon does the loop twice. The event is limited to 400 participants so don't wait too long to register!