Mike here, San Rafael resident. I have rideen all over Marin & Sonoma counties and am now expanding that area with more rides around Vacaville Sacramento and even Placerville. One road bike, one tandem road, one off road one off road tandem two recumbents, too much confusion.
Thanks to this thread will be riding the Vacaville ride May 20 on the road tandem, hope to see some of you there.