We can give you a quick capsule view of those ports. For Sicily we assume you are talking about Messina in which case we suggest going to Taormina. Athens - At this point we have to wait and see what happens with the political situation. But, assuming all is OK you might want to see the Acropolis, Syntagma Square and the Plaka. You can do Athens on your own or with an excursion. There is a good metro system that connects the port of Pireaus to downtown. As to Kusadasi, we strongly recommend you book a private tour (you can do this on-line) with one of the reputable local tour companies and make sure you include Ephesus and the Terrace Houses. We think the private tour companies do a much better job then the cruise line excursions in Kusadasi. As to Crete, if you have an interest in history and ruins take an excursion to Knossos. You can also do this on your own by renting a car or taking a private tour or taxi.