From Turku: Take Saaristobussi number 901-904 (Turku – Nauvo – Korppoo – Houtskär) from the Turku bus station. Buy a ticket for Norrstrandintie (you can also mention Tackork). The bus takes about 1,5 hrs. From the bus stop there is a walk of 1.3 km.
From Helsinki: Take a bus from Kamppi bus station to Turku bus station (takes between 2-3 hrs). There are various departures, find one here. (Train from Helsinki to Turku is also possible, trains here.) From the Turku bus station, take Saaristobussi number 901-904 (Turku – Nauvo – Korppoo – Houtskär) from the Turku bus station. Buy a ticket for Norrstrandintie (you can also mention Tackork). The bus takes about 1,5 hrs. From the bus stop there is a walk of 1.3 km.
You can find the Google Maps transit-instructions by clicking “directions” on the map further down.