Seen from the sea, Thasos is surprising for its colour: a deep green of pines and olive trees running down to the coves, unusual in the Aegean. Greece's northernmost island has lived from its white marble since antiquity, as well as from its honey and olive oil. Ships stop at Limenas, the island's capital, built right on the ruins of the ancient city. You disembark a few steps from the centre, and everything that matters can be explored on foot, among Greek remains, the old fishing harbour and tamarisk-fringed beaches.

An ancient city beneath the modern town

Limenas has one of the best-preserved ancient sites in Greece, and you can walk through it freely, without monumental fences. The agora stretches behind the old breakwater, with its porticoes lying in the grass; higher up, the theatre opens its tiers onto the sea among the pines; and the white walls still follow the outline of the 7th-century BC city. The paths linking these remains climb gently to the acropolis, from where the view reaches the coast of Macedonia.

The museum and its giant kouros

Steps from the agora, the archaeological museum is worth visiting for its stone guardian alone: a kouros carrying a ram, more than 3 metres tall, carved from the island's stone 26 centuries ago and left unfinished. Around it, ceramics, coins and sculptures trace the prosperity of an island coveted for its quarries and gold mines. The visit takes half an hour, the labels are easy to follow, and it gives meaning to everything you'll see outside afterward.

The old fishermen's harbour

The old breakwater, built on ancient foundations, now shelters colourful caiques and nets hung out to dry. The tavernas serve grilled fish, marinated sardines and tzatziki in the shade of plane trees, while the harbour cats keep watch over the plates. In season, figs and the island's pine honey round out the picture. It's the kind of place where an hour slips by unnoticed, between the creak of rigging and the regulars' conversations. In the evening, lanterns sway above the tables.

Swimming within walking distance

The Limenas shoreline is fine for an impromptu swim, but two quieter options await nearby. Makryammos Beach, about 3 km away, unfurls its pale sand in a wooded cove; taxis from the centre get there in a few minutes. Even closer, the coves along the acropolis trail offer clear water beneath the pines. Bring water shoes and a mask: the rocky seabed hosts surprising marine life for a simple waterfront, and towels go wherever the pines are willing to offer shade.

Marble, the island's white thread

Marble crops up everywhere: in the ancient walls, the doorsteps of houses, even the sidewalks. The quarries of Thasos already supplied building sites in Rome, and their pure white stone is still exported. Shops in the centre sell small turned objects, paperweights or mortars, souvenirs more lasting than many trinkets. This white thread links the morning walk to the afternoon stalls and gives the island its understated identity.

When the horn calls passengers back, the sun is already skimming the porticoes of the agora. You leave with salt on your skin, a little honey in your bag and the rare feeling of having walked all day through a living Greek city, where children play ball among the columns. Thasos doesn't speak loudly. It lets itself be carried away, like a marble pebble at the bottom of a pocket.