Dubrovnik is extraordinary in the precise moments before tourism occupies it — very early morning and late evening. The city walls, the Rector's Palace, the main street at six in the morning with nobody on it — these are the hours worth arranging a flight around. The rest of the year, arrive in October or March.
Limestone, Adriatic light, and the walk on the walls.
The old city is entirely enclosed within limestone walls — a medieval city-state preserved almost intact. The Stradun runs straight between two gates and is paved in the same pale stone as everything else. The Rector's Palace, the Franciscan Monastery, and the Sponza Palace are the three architectural poles of the city: each a different century's idea of civic beauty, all facing the same street.
Entirely dependent on the season and the hour. In summer midday, the city is overrun and uncomfortable. At six in the morning in October, it is as quiet and beautiful as a city can be. The old harbour — reached through the Ploče Gate — has a pace largely separate from the tourist pressure on the Stradun, even in August.
October and March are the correct months. May and June before the summer peak are also workable. July and August belong to the cruise ships and should be planned around accordingly.
Stari Grad (Old Town within the walls): The walled city — a single coherent space of limestone, barrel roofs, and church towers. Everything within the walls is walkable and connected. The Stradun is the spine; the steep lanes rising from both sides are the texture. The correct approach is to spend time in the lanes rather than the main street.
Old Harbour (Stara Luka): The small harbour inside the walls, through the Ploče Gate at the eastern end of the Stradun. Fishing boats, the Fort of St John, and the Dominican Monastery. The dusk light in the harbour is the image of Dubrovnik that advertising has not yet exhausted.
Gruž: The working port outside the walls, where the ferries to Korčula, Hvar, and the islands depart. A functional port town rather than a preserved monument. The local market on Gruž harbour is worth visiting on a weekday morning.
Lapad: The residential peninsula west of the port, with quiet coves and the Lapad promenade. Genuinely residential — the same Adriatic sea, without the crowds.