Karhusaari is just a small piece of land near Länsiväylä, the western way out of Helsinki to Espoo. Though squeezed near the highway there is a fine beach, an old Sinebrychoff mansion and a few paths. The Sinebrychoff mansion is part of the interesting history of family Sinebrychoff, other of two buildings left of their past.
In November 2011 the weather was quite warm, no sign of snow yet. Biking was great.