On Thursday, some friends and I are looking to beat the east bay heat and do something new. None of us have done Mt Tam yet and this seems like a good time to do it.
I don't know anything about the area though and would greatly appreciate some input on where to start the ride and recommended roads. Ideally we'd start in San Rafael just after crossing the Richmond-San Rafael bridge since that will maximize riding time and minimize driving time to/from home. We've got about 4 hrs of riding time available so a loop in the 50-60 mile range would be sweet.
Something like this looks promising though I'd like to extend it:
San Rafael / Mt Tam loop in San Rafael, CA, United States | MapMyRide