From culture to culinary delights, a Greek island cruise offers plenty to entertain and enrich passengers, says Marc Shoffman Get the Travel Insider newsletter for tips, deals, and inspiration from our global travel editor Get inspired with our free Travel Insider newsletter Get inspired with our free Travel Insider newsletter Email * SIGN UP I would like to be emailed about offers, events and updates from The Independent. Read our Privacy notice T he shiny blue domes of Santorini or beaches of