Pick-up from meeting points. Transfer by bus to the small port of Limanaki in Agios Sostis. Cruise on a kaiki, an old fishing boat, towards the island of Marathonisi. Along the way, we may have a unique opportunity to see Caretta caretta sea turtles, which reach up to approx. 1 meter in length. Free time on the beach. Swimming to the Keri Caves, free time. Depending on weather conditions, 2-3 stops are planned. Return to the port and transfer by coach to the designated points.