08:30 — Koulouri and coffee. Grab a sesame bread ring from a street vendor and a freddo espresso, Thessaloniki's default fuel, near Aristotelous Square — the grand, arcaded plaza that opens onto the sea.
10:00 — The White Tower. The city's symbol, a centuries-old round tower on the waterfront, houses a compact museum of city history; the rooftop view across the Thermaic Gulf orients you for everything that follows.
12:00 — Walk the Nea Paralia. The renovated seafront promenade runs for kilometers past gardens and the much-photographed Umbrellas sculpture by Zongolopoulos. On clear days, look for Mount Olympus across the water.
14:00 — Market lunch. Head inland to the historic Modiano and Kapani market quarter for a taverna lunch among the stalls — grilled fish, gyros or whatever the blackboard says.
16:30 — Roman Thessaloniki. The Arch of Galerius (locals say Kamara) and the massive fourth-century Rotunda — a Roman monument later used as both church and mosque, part of the city's UNESCO-listed Early Christian and Byzantine ensemble — sit five minutes apart.
20:30 — Ladadika by night. The restored warehouse district near the port glows with tavernas and bars. Order meze the local way: many small plates, shared, with ouzo or tsipouro.