join w/ the SF trail runners -18-20 miles from ferry in SF to tiburon ferry
Lets meet at the ferry building at 9am and run to TIburon! Eat lunch at Sams in tiburon if its a nice day or one of the other many restaurants around there and take the ferry back to SF. I will look at the ferry schedule in the next week or so and make things more specific.
heres a map: http://www.mapmyrun.com/routes/view/133601