Every time we fly south to Helsinki, people ask us: “You came all the way from Rovaniemi — is the city worth a few extra days?” The answer is always yes. And then we add: stay longer than you planned, and spend at least one of those days getting out of town.

Helsinki day trips are something we’ve genuinely done for years — for work, for long weekends, and once just because we missed the sea. We know which ones are worth the bus ticket and which ones are overhyped. This is that list.

Suomenlinna: the UNESCO sea fortress everyone should do once

We’ll be direct: Suomenlinna is one of the best half-days you can spend in southern Finland, and the fact that it’s only 15 minutes from the Market Square by HSL ferry makes it almost unfair. The ferry costs the same as a Helsinki metro ticket. You step off onto an island where Finns have been fortifying, fighting, and then just living for nearly 300 years.

What Suomenlinna actually is

It’s a UNESCO World Heritage Site spread across six interconnected islands. There are old cannons, sea bastions, tunnels you can walk through, a submarine museum, several small museums, and a lot of very old stone walls. In summer, locals come here to picnic, swim off the rocks, and have a long lunch. Tourists walk the fortifications and stare at the sea. Both groups are right.

Practical things you need to know

• Ferry departs from the Market Square (Kauppatori) every 15–30 minutes depending on time of day. Buy your ticket on the HSL app — it’s the same fare as a city tram.
• Last ferry back is around 2:30 am in summer, so missing it is genuinely hard.
• Plan 3–5 hours. You can see the main highlights in 2 hours, but the island rewards slow walking.
• The brewery restaurant (Suomenlinnan Panimo) is worth a stop for a local beer and the terrace view. Book ahead on weekends.
• Best swimming spots are on the south side of Kustaanmiekka, the southernmost island. You’ll need to walk 20 minutes from the main jetty.

Porvoo: Finland’s most photogenic old town

Joona grew up in south Finland and has been going to Porvoo since childhood. Alla fell in love with it the first time we went together — the kind of place where you slow down without trying to. If Helsinki is Finland’s capital, Porvoo is the country’s soul: small, a little weathered, wooden and wonderfully old.

Getting there

The easiest option is the direct Porvoo Bus from the Helsinki Central Railway Station. It takes around 50 minutes and costs about €10 each way. There’s also a seasonal steamship service from Market Square in summer — a beautiful 3-hour cruise that turns the journey itself into an experience. We’ve done both; the steamship wins on romance, the bus wins on practicality.

What to do in Porvoo

• The old town (Vanha Porvoo): Cobblestone streets, medieval church, red wooden warehouses by the river — this is the picture-perfect part. Give it 2–3 hours of slow wandering.
• Runeberg’s House: Home of Finland’s national poet Johan Ludvig Runeberg. Skip if museums aren’t your thing, but it’s a fascinating 45 minutes if they are.
• Brunberg chocolate shop: Porvoo has its own chocolate tradition. Alla considers their selections mandatory.
• Lunch by the river: Several cafes and restaurants line the riverbank. Book ahead in July — it gets genuinely busy.
• Walking east: Most tourists see only the old town. If you walk 15 minutes east of the main square, you hit a quiet residential Porvoo that very few visitors bother with. We like it even more.

The full Helsinki day trip list: 8 options worth your time

These are the trips we’d actually recommend — sorted by type, not hype. Every one is doable without a car, and every one we’ve done ourselves at some point.