A surf and turf option....Rent a bike near Fisherman's Wharf. Bike along the coastal path, through Crissy Field, then go up to the Golden Gate, bike across. Go down the hill just at the north end of the span and bike into Sausalito. Continue along the bay all the way around to Tiburon. Stop at one the restaurants at the end of the road for lunch and a great view:  Guaymas Restaurant for Mexican or Sam's Anchor Cafe or Servino Ristorante.

Then reward yourself and take the ferry back to the City.  

Biking across the Golden Gate Bridge to Tiburon and then take the ferry back!