Need ideas for winter activities near Helsinki

Hi all!

My cousins from Spain are coming to visit Finland for a week and I would like to do some snow activities with them, but without going to Lapland.
So my question is: Do you know any nice place to stay in a cabin, so cross-country ski, snowmobile, dog-sled...?
Preferably at driving distance from Turku or Helsinki.
Somebody recommended me Jämsä. What do you think?

Kiitos ja hei!