There used to be a large one out by the Salines. This is (or was) a secluded beach on the far side of the airport from Playa Den Bossa.

Cala Conta.Aguas Blancas.
Playa De S’Estanyol.Es Figueral.Es Cavallet.Cala Olivera beach (cala longa).plus if you get a baot to formentera.turn left once you get of at first drop off point.walk along beach a bit.thats a naturist beach as well.

Hi thanks for replies looks like a hire car needed as on google they look a fair distance from San Antonio where I am staying , still wont need to pack much in the clothes department ,

hope to have fun