[tevake]

Agree with Trekkor. A good day trip can be had just over the G G bridge! Marin offers great small towns, nice coast line drives, visits to Redwood forests. Refreshing break from the city.
You might want to drive down to Monterey, beautiful area and some Porsche interest in the area. Great dealer (can't remember his name right now). Surely someone will chime in with details. Has quite the showroom with lots of competition cars and rare Porsches. Monterey Aquarium is worth a visit too.

Also check out the bay front to see if the Americas cup boats are out sailing.

Have fun and congratulations,
Richard