In addition to the boulevard and a Larkspur sculpture that have drawn criticism in the past month, there is another, less-known relic of Sir Francis Drake in Marin, on the shores of the Point Reyes National Seashore. In 1949, the Sir Francis Drake Association of California erected this seven-foot granite cross dedicated to Drake and his legacy as a colonizer and Protestant missionary at the edge of the marsh on Drakes Beach, where he is thought to have landed for a five-week stay in 1579. Another cross dedicated to Drake stands in San Francisco's Golden Gate Park, similarly weathered and difficult to find.   David Briggs