The Fira to Oia trail follows the rim of the caldera, the sunken volcanic bay that gives Santorini its shape. It runs through the cliff-top villages, so much of the walk passes through cobbled alleys and along sidewalks. Other stretches are loose gravel and cliff path.

A visit is a long walk with no shade in summer, so the timing matters. Start early and carry plenty of water. The views over the caldera and the sunsets are the reason most people come, and the route is usually three to four hours on foot.

• Carry at least 1.5 liters of water per person, sun protection and sturdy walking shoes. Avoid flip-flops and sandals.
• Midday in summer has hardly any shade. Walk early morning or late evening in the hot months.
• Spring, fall and winter suit a full day of walking, with mild temperatures and fewer crowds.
• Check the weather before setting out, and reschedule if it is raining. Children under 10 and strollers are discouraged on the route.