That was a nice ride you had there - things have changed a bit since '72 though. It's a kick to walk around at night in downtown - some very interesting characters.
We used to cut school and drive down in a 67 Camaro with a 396, lifted in the rear and dropped a smidgeon in the front, nice rims - but like you it was a friends car. We did have fun hanging out.
The ones I know of were Pirates Cove in Malibu and Bates Beach in Santa Barbara. The swimming holes in Los Padres had a fair share of clothing optional too.