Kalymnos, with it's natural sponges and the Church of St Savvas. Nisyros, the volcanic Island where you get to literally stand in the volcano's crater, Leros, Karpathos and even Samos... the list is endless, or while you're here, discover Kos by joining an organised Island tour or a Jeep Safari.
Probably the most popular form of travel are the hydrofoils or the Flying Dolphins as they're affectionately known. Ferry boats are another way or one of the small sailing ships if you're in a romantic mood.
Kos and the surrounding islands have so much to offer that an excursion is an absolute must!