Visit the Greek island of Kastellorizo, barely 20 minutes and 6 kilometers (about 3 miles) from Kas, by boat. Kastellorizo has many attractions, including the Red Castle, which overlooks the harbor, and a few churches and shopping possibilities. There’s also the Blue Cave, one of the largest in Europe, which is said to boast a population of extremely rare Mediterranean monk seals, of which there are said to be less than a thousand remaining. Depart at 10:00, after passport procedures, for this island that is the closest to Turkey of all the many Greek Isles, and return to Kas around 16:00.