Steve,
It just dawned on me where you're going. Atleast when I was in my 20s the mouth of Tomales Bay was the most dangerous water on the US coast with a lot of drownings. The currents hit 6 knots through the upper bay and hitting any swells coming around the corner in hat current can flip you. I sailed a 12 foot boat across there and broke my mast step (where the base of the mast sits on the keel) and the mast leaned over about 45 degrees which meant that when the sail was blown flat to the water, we had green water flying past too fast to come in and swamp us. We turned around after making some repairs on the far shore of Point Reyes and sailed back, white knuckled, on one perfect tack across the wind and current and waves right up to the marina. Good luck to you, I'd never go back there again without a kayak, certainly not in a small daggerboard sailboat again.
Jim