Despite the growth in tourism the island has experienced, Santorini, one of the most famous islands in Greece, remains an enticing, mysterious beautiful destination.

The volcanic Caldera, i.e. the huge underwater crater formed by the eruption in the 16th century B.C., dominates the landscape. The same eruption resulted in three quarters of the island being submerged beneath the sea. Why not try the unique experience of a boat trip around what is left above sea level:

• On Néa Kaméni, make sure you’ve got some sturdy shoes to protect your feet and a bottle of water and you’re off to conquer the summit, in other words the crater of the volcano!
• On the islet of Paliá Kaméni, dive into thermal sulphur waters.
• On Therassia, the largest of the volcanic islets opposite Oia, you can ride a donkey to reach the top of the island and visit Manolás, a village which has bravely withstood the ravages of time. Enjoy the magnificent view of Santorini and the marvel of Potamós, a settlement consisting of cave-houses.

http://www.visitgreece.gr/en/culture/archaeological_sites/archaeological_sites_museums_of_santorini