2021 August: Methana is volcanic peninsula towards the north of the Peloponnese. There are many unmarked beaches that even in August are suitable for naturism. The one marked is is nice because the path to it starts at the free Pausanias baths. Provided it is a quiet season there is no reason not to enjoy a warm spa nude if you like. The beach is about 300m further on. It is also accessible from the road but parking will be an issue.