If you take a boat trip through the waters of Santorini caldera, the immensity of the scenery won't fail to bowl you over. On the small island of Nea Kameni a cinder path leads to the collapsed top of the volcano. Here and there, wisps of sulphurous smoke rise out of the earth, creating a strange atmosphere. At Palea Kameni the hot waters, green and sulphurous, invite you to take a dip with a difference. Finally, on Therasia, you can go swimming in Corfu Bay or visit Manolas, the island's main village.