If you want to enjoy magnificent viewpoints of the island and the caldera, you should hike from Fira to Oia. A 9-km long marked trail on the edge of the caldera connects the 2 cities. You will stop many times to take beautiful pictures, as the view is just breathtaking! It’s clearly one of Santorini’s best points of interest.
This marked trail isn’t really difficult, even if the weather can get really hot on sunny days. So, it’s better to hike in the morning or at the end of the day. You can for example plan your walk to arrive in Oia for the sunset. From Fira, you will reach Oia in about 2 hours. You should however plan a bit more time, as you will for sure stop a few times on the way to enjoy the panorama and take pictures.
Elvira Tips:
For the hike, it’s easier to park your car in Imerovigli than in Fira: there will be more parking spaces. As you will only walk from Imerovigli to Oia, you will do the Fira-Imerovigli part of the trail when visiting Fira. You should hike from Fira to Oia, and not from Oia to Fira. The most beautiful part is the view over Oia at the end of the trail.
Once in Oia, you can return to Fira by bus.