At the southern-most tip of the USA is beautiful San Diego, California -- my Reef home town and a playground for every water sport from skiing, sailing and surfing to fishing, snorkeling and scuba diving.

As a scuba diver you'll find an exciting variety of marine life in Wreck Alley, in various kelp forests and in La Jolla's massive underwater park.

The park combines La Jolla Submarine Canyon and Scripps Canyon, an underwater treasure of marine life including some of the more bizarre creatures among us.

The valley of this huge canyon system is about 1600 feet down. Its steep walls rise into two branches just made for convenient scuba diving access from the beach at either the La Jolla Cove or La Jolla Shores.

At the La Jolla Shores side you can start at the foot of Valicitos Street and swim to the buoys that mark the canyon's upper reaches. Better be pretty skilled at swimming in surf. Otherwise, take a scuba diving charter boat out of Mission Bay.

By the time you've descended to about 30 feet you'll be at the Scripps Canyon rim and its precipitous, narrow walls that plunge ever deeper toward the abyss. Be very careful here because the dropoff is nearly vertical at some points, often involving overhanging walls.

Visibility is good but variable due to upwellings and occasional strong currents. Winter water temperature is in the 50s; summer water gets up to the high 60s and sometimes low 70s.

Scuba divers and scientists alike have made the La Jolla and Scripps Canyons one of the most-studied undersea environments in the world. You can see the prestigious Scripps Institution of Oceanography and pier from any point along the La Jolla coastline. La Jolla Canyon's fan valley was the site of the world's first deep oceanic drillings, where core samples were retrieved from thousands of feet below the sea floor in 1961.

15 minutes south of La Jolla is Wreck Alley, about a mile off Mission Beach. Here you can explore artificial reefs created by eight sunken ships and a couple of unlikely structures that got there by both accident and intent.  part two