Open:April-October...Avithos Resort in Kefalonia Island , imperiously declaring its airy presence, escorted by an evergreen orchard of olive groves and cypress trees, Avithos Resort in Kefalonia Island, one of the most beautiful Ionian Islands in Greece, swarms with warmth for its guests.Consisting of seventeen buildings, Avithos is a 4 star hotel in Kefalonia, the largest of Ionian Islands in Greece.