At 10 AM you’re standing on fortress walls that Augustin Ehrensvärd built in 1748 to defend Sweden from Russia, watching ferries cross the harbour below. By 4 PM you’re sitting on a different island entirely — one that was locked behind military gates for two centuries — eating salmon soup on a dock while the chef brings fresh bread and a glass of white wine you didn’t plan on ordering. By 7 PM, the sommelier is pouring you a Nerello Mascalese from Mount Etna and the DJ is playing something slow enough that nobody wants to leave. The islands are one kilometre apart. The centuries between them feel longer.
This is six hours. Two ferries. Two completely different worlds. One of the best days you can have in any European city.
Morning: Suomenlinna (3–4 hours)
Suomenlinna is a UNESCO World Heritage fortress spread across six islands — the largest sea fortress in the Nordic countries, built from 1748 under Augustin Ehrensvärd’s command when Finland was still part of Sweden. A million people visit each year. The dry dock, built in the 1760s, is one of the oldest still functioning anywhere in the world. The church serves double duty as a lighthouse — the only one in Finland.
09:30 — Ferry from Kauppatori (Market Square). Fifteen minutes across. The fortress materialises out of the water like something from a different century, which it is.
10:00–12:00 — Start at Kuninkaanportti (King’s Gate) and walk the ramparts. The scale hits you when you realise these walls were built by hand across six islands. Suomenlinna Museum is free and worth an hour. The dry dock surprises everyone — a stone basin carved into bedrock where ships were repaired before the American Revolution.
12:00 — Light lunch on Suomenlinna. Keep it simple. What’s coming on the next island is better, and you want to be hungry for it.
Afternoon: Vallisaari (3–4 hours)
Vallisaari was a Russian ammunition depot, then a Finnish military base, then abandoned for decades while the forest grew through the bunkers and nature reclaimed every square metre without a single human decision. When the island opened to the public in 2016, it was the first time civilians had set foot there in over 200 years. Now there are nature trails, 18th-century powder cellars, and a wine bar with a sommelier and a DJ. The military ghosts are the atmosphere.
13:30 — Ferry back to Kauppatori, then onward to Vallisaari — both islands’ boats leave from the same Market Square. Check the JT-Line timetable for the next departure.
14:00–15:00 — Nature trails. The contrast with Suomenlinna hits immediately: instead of a million annual visitors, you might have an entire path to yourself — see the quietcation guide for why this solitude matters. Forest, cliffs, coastline. The powder cellars — brick vaults where the Russian navy stored explosives — are the kind of ruin that doesn’t need a sign to explain itself.
15:00–16:00 — Cafe IISI terrace, 100 metres from the dock. Oliver Laiho built this place because he believed a military island with south-facing sea views deserved better than abandonment. Coffee and the first glass of wine. The terrace faces south. The light at this hour is the reason you brought a camera.
16:00–17:00 — Walk ten minutes to Torpedolahti harbour. The chef at IISI Bistro makes a salmon soup that strangers will recommend to you unprompted — creamy, deeply savoury, served with fresh bread on a harbour terrace. Have a glass of wine with it. This is the meal you skipped lunch for.
17:30–19:00 — Wine tasting (Friday + Saturday). The sommelier picks five wines each week by theme — Italian one Friday, natural wines the next, Spanish the week after — and goes table to table telling the producer’s story. Between pours, the DJ plays. Eighty seats, about two hours, the Baltic Sea in every direction. Read about how the wine tastings work or book tickets.
19:00 — Last ferry or DJ Sunset. If it’s Friday or Saturday, the DJ keeps playing after the tasting — deep house and funk on the terrace as the light turns gold. But check the last ferry time first. Write it down. The alternative is a water taxi that costs more than everything you drank.
What to know before you go
Two car-free islands, both accessible only by ferry from central Helsinki’s Market Square. Budget at least six hours — this isn’t a trip you want to rush. The morning is culture and stone. The afternoon is nature and wine. The evening is whatever you want it to be.
- Shoes: Comfortable walking shoes. Suomenlinna’s cobblestones and Vallisaari’s forest trails both punish heels.
- Jacket: The islands are windier than the mainland. Bring a layer, even in July. Not a suggestion.
- Wine tasting: Book online. Saturday sessions sell out 1–2 weeks ahead. The Friday afternoon session is quieter and — between us — the sommelier takes more time at each table.
- Last ferry: Check the time. Write it down. Set an alarm. Missing it means a €50–150 water taxi and a story that’s only funny in retrospect.
Who does this day
Couples who want history in the morning and wine at sunset. Friend groups who want Helsinki’s best summer day without planning anything beyond this page. Solo travellers who want an adventure that needs no car, no guide, and no itinerary beyond “fortress, then island, then wine.” Wine people who want a tasting that doesn’t happen in a cellar or a hotel conference room but on a terrace on a military island under a sun that won’t set.
The morning gives you 1748. The afternoon gives you 2016. The evening gives you the reason you’ll tell someone else to do this exact day.
Oliver Laiho · IISI Vallisaari · Updated for summer 2026 with AI assistance.