A must on your Fira itinerary, the hike from Fira to Oia spans about 10.5 km and can take up to 2-5 hours. It’s fairly easy and well-marked but can be moderately challenging in hot weather, so if you’re hiking in summer, be sure to start early. The terrain varies from pavements to dirt tracks. You could even hire a local guide to spruce up the hike with interesting facts.