bruh I got you. Heres the gameplan: take the route 4 bus to the ferry harbor. From their you gonna permenately borrow a decent size boat from the Yacht Harbor or anywhere else in the san pablo bay for that matter, just make sure that fucker got a backup engine just incase the wind ain't on your side. then smoothly sail up to bodega bay for provisions like water, saltwater taffy and rum, then continue up north, once you get to the lost coast, holla at my man Larry that works at the local airplane strip he'll hook you with a ride to shelter cove no problem.
Or take the greyhound to garberville and throw up the thumb from there.