Melissani Cave is the most famous cave of Kefalonia and one of the most impressive water caves of Greece. It is actually a water cave found very close to Sami and it is worth visiting during the noon when the rays of the sun fall vertically into the cave. With 7 Euro you can board the boat and the boatman will take you around the cave, giving you a tour at the same time. Th boat trip last for about 10 minutes, as the cave is rather small.