Your post correctly features Croatia quite a few times!!! Naturist beaches in Croatia are often marked as "FKK". This photo of Playa de los Muertos is courtesy of TripAdvisor. Besides basking in the sun, this seven day cruise is a chance to mingle and get an up close of the Adriatic Sea and its surroundings. Euronat, France Euronat is one of the largest naturist holiday destinations in Europe at hectares.