For $7.85 with Golden Gate Ferry or $9.50 with Blue and Gold Ferry operators you take take a ferry across the bay from Sausalito to SF (or vice versa). Sausalito is a pretty little town nestled in the hills overlooking the bay. Bikes are allowed on the ferries for no extra charge and it's a great way to end a ride from SF to Sausalito. Along the way you'll have great views of Alcatraz, GG Bridge, Berkeley hills and SF. 20 min.