You'll want to browse the collections at Art Space Santorini, Santorini Folklore Museum, and Museum of Minerals and Fossils. While you're exploring, swing by Ancient Thira, Ancient Akrotiri, and Panagia Episkopi to learn a bit about the area. Kamari Beach, Perissa Beach, and Perivolos Beach are great spots if you want to spend some time by the water during your stay.