Santorini has a long and rich history and there are dozens of historic sites, museums and ancient churches and monasteries to explore. Highlights include ancient Akrotiri, with frescoes dating back 5,000 years, 17th-century Agios Nikolaos monastery, Mesa Gonia's Byzantine church and Fira's archaeological museum.
A trip on the cable car from cliff-top Fira to the port is a must for the views. Fira itself is a charming labyrinth of winding lanes, accessible only by cable car, on foot or by donkey.
Boat excursions in the caldera to visit the other islands in the Santorini group are popular. At Palia Kameni you can take a hot mud bath in natural springs. Thirassia, the largest island after Santorini itself, is a charming place, like a mini, less-developed Santorini, with great views across to Oia.