On January 1, 2011 I was delighted to find a healthy population of small oysters living on the rocks in the rocky areas between Keller Beach and the San Rafael Bridge. This area is accessible at low tide. I visited the area at minus tide which made the entire beach accessible. The next 2011 minus tides are January 16 – 22 between 3:43 -7:41 pm; and January 29, 30, and 31 between 3:03 – 4:33 pm. Check local tide charts for details.