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Photo: Line Lasserre, CC BY-SA 4.0 via Wikimedia Commons
By far the most spectacular hike on Thira is the 11 km trail along the crater rim to Fira. It offers some breathtaking views over the caldera, and the other islands of the archipelago. At a moderate walking pace, the hike takes about 3 hours. The trail starts at Amoudi Bay and follows the rim east through town. It is well-marked; you'll see a few "To Fira" signs as you leave town. Going from Fira to Oia is more uphill, with a climb of over 300 m, so this direction is considered a bit easier.
Órmos Ammoúdi, Όρμος Αμμούδι
The most picturesque bay on Thira, the moon shaped bay is surrounded by barren cliffs and a lovely promenade with restaurants. Fantastic spot to watch the famous sunset, although it tends to get crowded for that reason in the evenings.
Kasteli Agios Nikolaos
Ruins of a Byzantine fortress that are a prominent landmark in the oldest part of town. It offers fantastic sunset views in the evening. The history of the castle dates back to the 15th century, and it survived for almost 600 years. Unfortunately, like many other structures on Santorini, it was largely levelled by the 1956 earthquake. Only the base of a tower and facade remain of what was once an impressive defensive structure built to protect the island from pirate attacks.
Harder to reach than Amoudi Bay, and therefore far less crowded. Limited facilities, but great for a swim.
Quiet pebble stone beach with the adjacent Katharos Lounge which serves great food.
Christian Orthodox church.
Archaeology museum in a converted traditional house in the centre of town. Its collection features figureheads, seamen's chests, historic maritime equipment, drawings and maps, and models of old and new Thirean ships. There is special attention to the history of the Hellenic Navy.