A little bit far away from city center, but accessible by metro with the Südstern metro station close by. Volkspark Hasenheide is both a great place to come to sunbath naked in the nudist area and also a gay cruising area next to the FKK zone, in the forest located on the slope of the hill next to the nudist area. The forest is quite dense so offers a good privacy and therefore is both busy by day and by night. Great spot to check out if you happen to be in the south of Berlin.