a day trip to area surrounding san francisco

This can be done in one day, if you dare.

Morning - visiting Muir wood nation park (looking for direction Muir wood road, Mill Valley, CA)
Late morning - retreats to Marin Headlands to visit Point Bonita light house
Noon - arrives at Sausalito old town to have lunch
Afternoon - proceed to sausalito water front, sausalito fort baker, golden gate recreation area.
Evening - driving back to golden gate park in san francisco
Evening - going up to Twin peaks to have a perfect view and "enjoy" the cold breeze during summer. (via Twin Peak Blvd)