On the west side of Agios Efstratios is Lidario beach.
At Lidario beach you will enjoy the sun and its wonderful golden sand, combining them with a wonderful swim in its crystal clear waters. But make sure to come equipped as here, as on most beaches in Agios Efstratios, it is just you and nature.!!!!
You can go either by boat or by car (perhaps better a jeep or 4x4, depending on the season and if they have paved the dirt road). It is generally accessible, clean water.