On your way up north, take a drive to the top of Mt. Tamalpais, and a little walk around the Verna Dunshee memorial loop trail, views of the whole bay area.
As you come out of the parking lot at the top of Mt. Tam, there is a sharp curve, with a little dirt parking area at the fire road. About 1/4 mile north up the fire road, there will be a little trail that heads down the mountain, through the woods, to the north east. A few hundred yards down the hill, you'll find the Kisbane Hermatige. Not a public camp, but for A declares the hand painted corrogated metal sign. If you reach lookout rock, you've gone too far, The Kisbane is easy to miss.
Then drive down to Pantoll Ranger station, park and take the hike down the mountain to Stinson Beach. Your in the shade of the woods for most of the hike, and it's all downhill.
You'll have to hitchhike back up to Pantoll, then drive out along Bolinas ridge, pretend you are in a car commercial. If your lucky you will be right at the fog break as it blows up the mountain, dissappating at the ridge.
From there head up to Point Reyes, and park at the trail head that leads to Abbott's Lagoon. There should still be enough water for a swim.
On your way out, see if you can find a local to direct you to the Pygmy Cypress forest, up above Fairfax. Middle earth has nothing on this amazing stand of pygmy trees.
I miss Marin..........