I plan to be there myself sometime in July. I retired from the work force in December 2002 and moved from Lake Forest to Salt Lake City to be closer to most of my grandkids. I bought the Explorer II in November 2003 and am still in the process of moving up the learning curve. So, be cautious about using any advice that I give you.
When visiting family in Southern California, I mostly hunt the wet sand in Huntington Beach, San Clemente and Oceanside. While living in Southern California I hunted the beaches with many different types of detectors (White's XLT and older Garretts and older Fishers). My personal experience has been that the Explorer II is much better on the beach (and everywhere elsewhere else for that matter) than the other detectors I have used. You should be able to pull out dimes in the 10 to 12 inch range in the wet sand.
HH,
Glenn