On Saturdays (from 25 November to 16 December) there´s direct bus link from Helsinki.
Departure from Helsinki, Kiasma museum bus stop 10:30 am. Departure back from Fiskars at 4:00 pm.
Tour price 20 € /adult, 10 €/child 4-17 years, 15 € senior citizens and students. Booking and more information: www.frimantravel.fi