Also, as Santorini is just a very short boat trip from Therassia, do not miss the opportunity to visit the prehistoric settlement of Akrotiri as well as its museums and various archaeological sites. You will be impressed by the wall paintings, everyday objects and tools of a thriving prehistoric community that the volcanic ash and lava covered back in 1650 B.C. At the same time the Geological Park of Nea Kameni offers the unique experience of hiking an active volcano and swimming in the hot springs of the island.