The walk along Santorini's caldera to Oia from Fira is one of the best and most scenic walks I've ever done. As it is, Santorini is stunning and you can get a lot of iconic Greek isle photos along this route. And at the end of the walk, grab a good lunch or dinner in Oia.
We walked in the morning, starting the 9km walk from Fira - following the signs from the cable car in the direction of Imerovigli. After this it's fairly evident that there's only one path going toward Oia. Other...