Is Spielplatz still there? As a GI in 1959, I visited the camp while on leave from the US Atrmy in W. Germany. I found the camp listed in a newspaper in London and called to see if I could come up as a single man.
A cherry woman's voice said "Do in deed come" and gave me instructions of which "tube" and bus connections to make. i made it up the hill to the "Check in" and have been a nudist 50 years afterward!