I love to mountain bike in the Marin Headlands, especially during the fall season because it is usually sunny and warm. Also, in my opinion, the Headlands offer the most visually impressive views in the whole County. I went on an awesome ride in the headlands with Alan last week.
News: I have a new column on the MoreMarin blog which has a section in SFGate. You can read more about my Marin headlands ride here.