My friend recommend Santorini and added the following message about ferries:
You can take the ferry to the Cyclades (island group which includes Santorini and Mykonos) or you can take a fast boat (http://www.ferries.gr/). We opted for the latter since it cut down the boat time by three hours. If you want to use the high speed boat then you can buy your tickets here: http://greece-ferries.forth-crs.gr/english/npgres.
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