A few weekends back we were looking for a good hiking trail North towards Petaluma so that we could make a visit to the Lagunitas Brewery in the afternoon.
A quick search brought up Mount Burdell in Novato, and we hit the road. It is pretty terrain up there. The paths weren't marked perfectly, and so our hike was a bit more uphill than we had anticipated, but it was a great workout.
The blue skies were beautiful.