Many find the dark time of the year depressing. I am certainly also less inclined to get going in the evenings, when it’s getting dark at 4-5pm. But the right approach is to embrace it, and nothing beats the bbq atmosphere you get when grilling sausages on real fire, in the crisp air of a dark Autumn evening (afternoon) with your family.
We went to the fire place on the festivity area (juhlakenttä) on Seurasaari/ Fölisön. There is wood and paper for everybody to use, however, it is a popular place so sometimes they run out of wood. One should take matches or a lighter along, though. Obviously all users are also responsible for the fire and to see to it that it dies out before leaving it unattended.
The walk to the festivity area on this small island is nice. First you walk over the white bridge, and then you just need to follow the biggest path and street lights. The walk is aligned by the old buildings that are apart of the open air museum on the islands.