Start at Marina Green near Crissy Field, run west along the water to the Golden Gate Bridge. About 2 miles one way, mostly flat until you hit the bridge approach. Perfect for morning runs when the fog is lifting.

Go before 7am to avoid crowds and get better visibility through the marine layer. Path is well-marked and you'll see other runners. Bring layers — It can be 20 degrees colder near the water. Water fountains available along the route.