Neftina Beach
Neftina beach is very close to the archeological site of the Cavirians, north of the island.
Golden vast sand, clear and cool waters. On one end of it you'll find the chapel of Agios Athanasios, while on the other end the rocks are the perfect place for amateur fishermen.
There's no organizational infrastructure, but surrounding jujubes around will lend their shade when you need it.