Sikinos is situated in between Ios and Folegandros. The island has an area of 42 km² but only about 300 people live there. Sikinos is on of the least touristy places in the Cyclades. Visiting the islands in many ways feels like travelling back in time. It's fantastic. You may or may not meet other tourists but even if you do it's fine. There is a fair chance that they are like-minded people, explorers on a quest to discover the real Greece. No one ends up on Sikinos by coincidence (except me). Such knowledge creates a bond.
What is there to do on Sikinos? Quite frankly: nothing. There is absolutely nothing to do on Sikinos. The best the island has to offer is solitude and friendly locals. You can go for a walk for example. The island is mountainous with green and fertile valleys. The locals make their living with farming and fishing. It is a modest life but that doesn't mean they aren't happy. Quite the opposite; my impression was they live exactly the life they want to live.
There are three settlements on Sikinos; the port Alopronia and the two mountain villages Chora and Kastro. The two are actually hard to distinguish. They have more or less grown together.
Alopronia the port of Sikinos
All ferries to Sikinos arrive in Alopronia. The port is so
small it doesn't even look like a village. There are a couple
of restaurants though and a few rooms to rent. The local
beach is all right but not as good as the beaches in Agios
Nikolaos and Katergo. Both can be reached by foot. Worth
visiting is the small local museum. For a change it is not
about archaeology but about Olives.
The two villages are so close together that they appear as
one. You will see the typical white houses, narrow alleys,
wind mills and a beautiful church. The main difference to
other islands is; this is the real thing. These villages
don't try to impress tourists (since there are none). These
places exist for hedonistic reasons. These place are so
lovely because the people living there like it that way.