Oia at sunset is a logistics problem wearing a famous view. The lanes fill, the steps become one-way in practice, and the photograph everyone came for is taken over someone else’s shoulder. The same architecture is quiet at dawn. The trip works if your hotel is close enough that “dawn” does not mean a taxi you cannot find.
Stay in Oia or the quiet edge of it if the dawn walk is the reason you came. Fira is the transport hub and the better base for buses to the rest of the island, but it adds a transfer to the one hour you care about. A cave hotel with a caldera view is a different purchase from a room “in Oia” that faces the road. Read the walking note in the listing. Some of the prettiest doors are eighty steps below the lane, which is romantic at noon and a luggage problem at midnight.
Book the hours, not just the room
If you want a sunset dinner with a view, reserve it when you reserve the room. Walking up and hoping is how you eat well and see nothing, or see everything and eat standing. Many terraces seat on a fixed turn. Ask whether the table is for the view or merely on the property. Those are not the same sentence.
Buses between Fira and Oia are frequent in summer and still fill. A private transfer is worth it on arrival day if you land in the afternoon with a dinner time already printed. Ferry arrivals into Athinios are a separate project: the port is at the bottom of a cliff road, and the first hour on the island is a bus or a taxi queue. Do not schedule a winery tasting for the hour after the ferry unless the winery is sending the car.
A day that stays pleasant
Walk Oia early. Swim late morning at a beach you can reach without a parking fight — Ammoudi is the local option under Oia if the steps are acceptable; a driver to Vlychada or Kamari is calmer than circling the black-beach lots at 13:00. Keep the late afternoon for a pool or a shaded room. The island is a caldera, not a city, and the heat in July is the main exhibit.
Shoulder season — May and late September into October — is when the walk and the restaurant reservation can coexist. August can still be wonderful if you accept that the famous hour belongs to the ships and your best hour is the one before breakfast.