Day 1 — Senate Square & the Historic Centre
Start at Senate Square, Helsinki's neoclassical core, dominated by Helsinki Cathedral's white dome atop a grand staircase. The Government Palace and University of Helsinki complete the ensemble, all designed under Carl Ludwig Engel in the early 19th century. Wander into Kruununhaka, the oldest and quietest neighbourhood in the city.
In the afternoon, walk down to Market Square and the South Harbour, where Uspenski Cathedral — the largest Orthodox cathedral in Western Europe — sits on its own rocky rise. Have dinner in the city centre and spend the evening exploring Kallio's bar scene.
Day 2 — Suomenlinna Sea Fortress
Give Suomenlinna a full day. The ferry from Market Square takes 15 minutes and runs every 20 minutes, covered by a standard transit ticket. This 18th-century fortress island, a UNESCO World Heritage Site, has 8km of walking paths along the sea walls, several small museums, cafés, and a resident population of 800. Bring a picnic from the Old Market Hall and spend the afternoon walking the ramparts and swimming if the season allows.
Return to the mainland for dinner in Punavuori.
Day 3 — Rock Church, Design District & Sauna
Morning: Temppeliaukio Church, the Rock Church excavated into bedrock, is a short walk from Töölö. Its acoustics and unusual architecture make it one of the most memorable buildings in the city.
Midday: the Design District in Punavuori — Marimekko, Iittala, and the Designmuseo. This is the neighbourhood to buy genuine Finnish design rather than souvenirs.
Evening: sauna, done properly. Löyly on the Hernesaari waterfront or Allas Sea Pool floating in the South Harbour both offer the full ritual — heat, cold Baltic swimming, repeat. Budget at least two hours and don't schedule anything after.
Day 4 — Ateneum, Kiasma & Töölö
The Ateneum Art Museum holds Finland's national collection, including the golden age painters Akseli Gallen-Kallela and Helene Schjerfbeck — allow two to three hours. Nearby, Kiasma, Steven Holl's sinuous white contemporary art museum, is worth an hour even for those who find contemporary art hit-or-miss — the building itself is the draw.
Walk around Töölönlahti bay to see Finlandia Hall, Alvar Aalto's white marble concert hall, and the National Museum, whose granite tower and frescoed entrance hall trace Finnish history from the Stone Age onward. Töölö's Art Nouveau apartment blocks make for a good slow wander in the late afternoon.
Evening: dinner in Töölö or back toward the centre.
Day 5 — Porvoo Day Trip
Porvoo, Finland's second-oldest town, is 50km east of Helsinki and about an hour away by direct bus from the Kamppi terminal. The old town is one of the best-preserved in Finland — cobbled lanes, wooden houses, and the row of ochre-red riverside warehouses along the Porvoonjoki river that appear on postcards across the country.
Walk up to Porvoo Cathedral, climb the low hill behind the old town for a view over the red rooftops, and spend an hour or two browsing the antique shops and small galleries on Old Town streets like Välikatu. Stop for coffee and a slice of Runeberg torte — a rum-soaked almond cake associated with the poet J.L. Runeberg, who lived in Porvoo — at one of the riverside cafés.
Return to Helsinki by early evening for a final dinner in the city centre.