Helsinki Adventure Sports: Ice Swims, Canoes

The biggest jolt in Helsinki is the moment you climb down a ladder from a hot sauna into the Baltic. The city is flat and coastal, with no mountains or rapids, so its adventure sports run on cold water, forest lakes and one very fast roller coaster. Prices are in euros.

Cold-water swimming

Finns call the sauna-and-plunge habit avantouinti, ice-hole swimming. You heat up in a sauna at 80 to 90 degrees, then lower yourself into sea water that sits close to zero in midwinter. It is the closest thing Helsinki has to an extreme sport, and locals do it all year.

Löyly, the timber sauna building at Hernesaarenranta 4, has a smoke sauna, a wood-burning sauna and a ladder straight into the sea in every season. A two-hour public session costs €29 with a towel, and booking ahead is recommended (loylyhelsinki.fi ). Allas Sea Pool, by Market Square, has an unheated seawater pool next to a heated one, so you can switch between them; it was about 14 degrees in early October. Two hours cost €19 Monday to Thursday and €24 from Friday afternoon to Sunday (allaspool.fi ). Kuusijärvi is another place locals go for the same sauna-and-plunge routine.

If you would rather go with a guide who explains the ritual, compare sauna sessions on Viator .

The cold causes a gasp reflex, a fast heartbeat and a jump in blood pressure. Climb in slowly using the rail, never dive in head first, keep your head above water, and skip alcohol beforehand. A wool hat and neoprene booties help. Anyone with a heart condition or high blood pressure should ask a doctor first, and nobody should plunge into freezing water alone.

Paddling and hiking in Nuuksio

Nuuksio National Park, in Espoo, is spruce forest, granite gorges and dark, clear lakes, and you can hire a canoe on Lake Haukkalampi. Getting there takes about an hour: a commuter train (lines E, L, U or Y) to Espoo Centre in about 25 minutes, then bus 245 or 245A to the Haukkalampi stop and a walk of about 1.5 km to the lake. The bus runs further in summer than in winter, so check the HSL journey planner for your ticket zone and return times. The marked Korpinkierros loop is 4 km and the Punarinnankierros loop is 2 km. Directions and trail maps are on luontoon.fi .

To have the transport and a guide handled for you, search Nuuksio trips on GetYourGuide .

A launched coaster at Linnanmäki

Linnanmäki in Alppiharju runs Taiga, a multi-launch coaster, and Vuoristorata, a wooden coaster from 1951 that still carries a brake operator on the back of each train. Entry always needs a ticket or a wristband; the Isohupi wristband is €53, or €49 on Fun Fare days. It is a summer park, and in 2026 it reopens only from 9 to 18 October for the Carnival of Light. Dates and ride lists are on linnanmaki.fi .

Tunnels on Suomenlinna

For something gentler, the sea fortress has dark, twisting artillery tunnels to explore by phone torch. The HSL ferry from Market Square takes about 15 minutes on an AB ticket (€3.30 in the app, €3.50 contactless), with boats every 15 to 30 minutes in summer and every 40 to 60 in winter (hsl.fi ).

Winter ground

From late autumn to early spring the real hazard is the pavement. Thin, almost invisible black ice, pääkallokeli, is behind the most common tourist injuries between November and March. Pharmacies and supermarkets sell slip-on studded grips (liukuesteet) for about €15 to €25. Around the winter solstice there are under six hours of daylight, so plan Nuuksio walks for midday.

Verdict: Löyly’s sea ladder is the one to do, because it is the experience Helsinki does better than anywhere else on this list.

Read more: Helsinki day trips covers the train and bus to Nuuksio alongside Porvoo and Tallinn.

Tip: pack a wool hat for the sea ladder; it keeps your head warm and reminds you to keep it above the water.

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