I get it. One of the things I don't particularly care for is the overcrowding at the beaches. Plus, quite a few in Southern California are kinda gross (PB and OB - smell like piss, alcohol, and too many bums and drunks around). We won't even put the rescue swimmers in the water after it rains because the bacteria runoff going into the water will make you/them sick. If it's a search and rescue case, completely different story. For training, it's a no-go.
Fortunately, I have 3 places I can go where either only the military has access or areas very few are allowed on. You literally have the whole beach to yourself. Occasionally, you'll an interruption. Made the mistake of going to Gator Beach on Coronado during the weekday and heard a whole bunch of yelling ... a few seconds later all the guys at BUDS were getting beat and the SEAL instructors had the whole class get in the water. Just made a point to go further south so I was out of their way.
Some of the Texas, Oregon (never been personally), and Florida beaches you can drive on, which is nice, especially when you're out there by yourself or with your family; not a care in the world.
You may have to take a look at SDSU's females ... errrr "facilities", too