I don't camp with sharks, but i have dived in their waters, especially off San Miguel Island, which has some nifty historic shipwrecks. The thing there is to spend as little time as possible on the surface. Get in, get under - get up, get out, making as little splash and disturbance as possible. Like bears,sharks are relatively unpredictable. There are procedures which diminish your chances of a shark encounter,but nothing is guaranteed.

Cal Game and Fish, I understand, does not allow any of their personnel to dive in that area. There was at least one fatality a few years ago - a commercial fisherman who was using motorized equipment on the surface.

Wherever you are, learn and study the local hazards, and adjust your procedures accordingly