Depending on what you consider an island, Greece has between a thousand and six thousand islands, of which over two hundred are large enough to be inhabited. Some of those are major tourist attractions.
Crete is the largest Greek island, with a population of over 600.000 people. Heraklion is its capital and largest city. Attractions on Crete include the Samaria Gorge, the ancient Knossos, the Aquaworld aquarium, Balos lagoon.