Walk from Oia to Fira late in the day when it's cooling down. Get the bus to Oia, spend some time in this beautiful jewel of a place, then walk the six miles or so back along the cliffs to Fira as the sun is setting - magical! Not forgetting the comfy shoes!
Oia is on the end of the island - a 20 minute bus ride from Fira.
The old port of Santorini originally could only be reached by the long winding set of steps down from Thira. All 888 of them, or 588, but lots! The locals came up with an easy way for seafarers to go up to the town of Fira: use mules to carry people up and down. Today the tourist and charter boats bring tourists in who ride the mules up to Fira for their short stay on Santorini.
One can get to the old port (it is worth a visit) by walking down (which we did). The choice is then to either take a mule ride back up or take its modern equivalent, the cable car. We chose the cable car for the views, speed and smoothness. Both the mules and the cable car cost. One can also think about walking back up... but I recommend against it.
Follow the signs to the steps or the cable car station in Fira. The cable car is 3.50 euro per person each way;
Take the bus from the main town of Fira to Imerovigli (about a 5 minute ride). Then walk along the rim of the caldera - it's about a 2-3 hour walk with spectacular views of the caldera the whole way. Ia is a great place too, and you can catch the bus from there back to Fira.
The bus station in Fira is located just south of Platia Theotokopoulou. The path from Imerovigli is clearly marked all the way to Ia.
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