Day 6: NISYROS – COS (KOS) Early in the morning we will cruise to Nisyros Island and will have a swimming break. You can take an optional bus tour to the crater (volcano) which is still active and you will see the gases coming from underground. Then we will cruise to Kos Island. You may take a quick swim in Lambi Beach which is very close to Kos Harbour. Kos is one of the islands with the best night life. Nafklirou, a street full of bars, is always crowded, colourful, and full of life.