Multi-colored coastlines of intricate shapes, covered with dark gray sand, black pebbles or red volcanic slag, are definitely worth seeing with your own eyes, as is the sea surface - blue, turquoise, green or almost black. If you are going to Santorini for a couple of days, stop at the most accessible beaches, which can be combined with excursions to ancient cities, archaeological sites, churches and monasteries. You can learn more about them at https://santorini-more.com/santorini-beaches/. And if there is enough time, explore the entire coast, following the advice of experienced tourists.