Charter a boat to sail Coronado islands or San Diego bay
I've had a special affinity for sailing ever since I sailed from the Florida keys to the Bahamas on a boat that was only powered by the wind, there was no engine. The time I spent living on that sailboat for just over a month is one of the most memorable experiences I've had in my life. In San Diego you can charter a sailboat- any type you want- and sail around the bay or head out to the Coronado islands.
The Coronado islands can be seen on clear days from San Diego and are a group of four islands that have been set aside as a wildlife refuge by the Mexican government. You can anchor, snorkel or view wildlife from your boat, but aren't allowed to land on any of the islands. http://www.sandiegotraveltips.com/public/The_Mystique_of_the_Coronado_Islands.cfm
Tip: If you head out to the Coronado islands, you will need to have your passport with you.