Did the Spinalonga tour. The vessel is quite large and quite old, and a bit rough in places, although we felt safe. It is quiet, though, compared to a lot of Greek tour boats. The crew are friendly and helpful. Food and drink options are good for a short trip. The tour of Spinalonga was a little disappointing, our guide took us to a ruined building near the entrance, told us about the island for 20 mins or so and then left us to our own devices. We were expecting to be taken around the island with explanations as we went. It was still worthwhile though, and we would happily do it again the next time we are in Crete.