I wasn't certified when I lived in San Diego, but this was my favorite snorkeling spot. The parking's not too abundant, but the marine life more than makes up for that. When the surf's down, it's an easy walk across the sand. Starting in just 3 feet of water, you're likely to see large stingrays (8 foot wingspans), leopard sharks, and guitarfish (skates). Garibaldi are also common around the kelp. Call the surf report before going if you want to make it worthwhile. Wetsuit necessary except for the end of summer.