I'm planning to visit Helsinki in November and I can either spend 2 days (2-4 Nov) or 3 days (1-4 Nov) there. Since its winter when I'm there, how much is there to do in Helsinki in winter? I'm interested to visit Suomenlinna but I'm not sure if its open that time of the year. I tried looking thru the Suomenlinna website but it only lists the Summer opening hours. Can anyone help?