The outdoor scenes (and likely some of the indoor, as well) were filmed at Elysium Fields in Topanga Canyon. I know that because I frequented the resort back in the late 80s and 90s. I never thought I'd see it again (it closed permanently in 2001). For that reason, this is now one of my favorite movies.
"The place said to have inspired Jim Morrison of the Doors to write the song "Roadhouse Blues" once also inspired many to take their clothes off - and stay that way. The nudist colony, known as Elysium Fields, opened it's welcoming arms in the 60s to Bohemians living the hippie lifestyle in the hills of Topanga Canyon - the purpose being to offer solitude in uninhibited nude living. Those of the happy commune enjoyed their personal freedom until they were inadvertently forced to sell the property in 2002."
"The place said to have inspired Jim Morrison of the Doors to write the song "Roadhouse Blues" once also inspired many to take their clothes off - and stay that way. The nudist colony, known as Elysium Fields, opened it's welcoming arms in the 60s to Bohemians living the hippie lifestyle in the hills of Topanga Canyon - the purpose being to offer solitude in uninhibited nude living. Those of the happy commune enjoyed their personal freedom until they were inadvertently forced to sell the property in 2002."