Mt Tamalpais via the Steep Ravine Trail
If you wanted to, you could drive almost to the top of Mt. Tamalpias. But if you want to really climb Mt. Tam, then start from the ocean. This hike leaves from Stinson Beach and climbs the Steep Ravine trail up to East Peak, then loops back on the north side. The grand total is over 16 miles, and a few thousand feet of elevation gain.