I was wed on a cruise ship off the Isle of Santorini (which we spent the following day on). My family and I have visited numerous Caribbean islands, as well as Malta, Sicily, Ibiza, Fiji and Bora Bora on various vacations. I would enthusiastically return to any of these.
Japan is a chain of Islands, so I guess it fits the bill as well. Kyoto may be the most beautiful place I’ve ever been.