Nudist beach, it is more like a cove next door, very calm and silent. Nudism is allowed on any beach. In fact, from Punta Carrión, all the beaches/coves are nudist (it can be read on any Galician blog/page, since They recommend this area precisely for that reason), another thing is that people do not respect and wear their swimsuit.
Of the 36 beaches on the island, you should wear your swimsuit in the 3 coves that have specific nudism...well, it gives you something to think about.
Even if a sign were put up, people would still not respect it.
In any case, the area is wonderful and worth visiting.