April and May, as well as September and October, are great times to visit popular Greek islands like Mykonos, Santorini, and Crete, with comfortable temperatures and fewer tourists.
Mykonos sees a decrease in visitors during these periods, making it easier to explore its narrow streets, beaches, and vibrant nightlife without the crowds. Santorini's famous whitewashed houses and blue-domed churches take on a serene quality, and the scenic views of the caldera are less crowded.
Crete, Greece's largest island, offers a wealth of cultural attractions, including the Palace of Knossos and the Heraklion Archaeological Museum. The shoulder season is ideal for exploring Crete's many beaches, ancient ruins, and traditional villages without the chaos of peak tourist season.