Just across the LA River from Dodger Stadium--not the most pristine environment, and apparently no showers:
Rio de Los Angeles State Park
Anybody in the area to check it out?
I also see that apparently San Clemente State Beach has them again:
SoCal Christmas Tour: Doheny State Beach to San Clemente State Beach:
though possibly just at the ranger's discretion.
This was a very nice site back in the day, but there were a lot of kids swarming everywhere in the summer.
I wonder if they have them at Carlsbad again, too...