There's this one place called Lytle Creek where my dad now lives with his friend, it is a really small but pretty wooded area that would be a good place to hike in southern cally. The creek rangers don't officially allow nude hiking because of textile people who live in houses along the creek, but most of the creek and its two waterfalls are in completely uninhabited mountains. I'm sure if you ask the rangers when the creek is least populated and went hiking nude deep in the forest during that time no one would know.
Unfortunately the creek is also regularly visited by hooligans that throw loaded diapers, Dorito brand corn chip bags, and old batteries into the area when in fact there are trash bins 5 ft. from the picnicking areas. Some young punks also think it cool to place graffiti tags on the boulders around the water falls. I don't know if many people here can, but the creek rangers need (3-4) volunteers to help clean up the rubbish and erase the tags. The rangers also tell me LARGE TRASH BIN SIGNS in English y Español would be appreciated. If you are interested just drop me a pm and I'll send the info you need to contact/find them.