The Bay Area Open Space Council has released a BETA version of a new website designed to help hikers (and campers and cyclists) easily find local trailheads and campgrounds. A scalable Google map makes the site easy to navigate. You can also plan your trips on public transportation (my test case was a random spot in southern Marin to Skyline Wilderness in Napa -- pick your own starting and ending spot -- it's great fun!) .
It is still BETA -- I was just poking around and saw an icon in the wrong place here and there, but what a great resource for bay area hikers and folks from out of town planning hiking/camping adventures.
Transit and Trails
Photo from Skyline Wilderness Park in Napa -- reachable by public transit!