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Make sure you come on the right time of the year, january-march is the best time for snow, and don’t stay in Helsinki, you won’t find this in the capital city 😁

I will never understand people that go to other countries and just visit the city, nature is the most beautiful thing there is, BTW can u see the northern lights from Finland ? Always wanted to see the northern lights
What are the laws over there about camping? I know that in Norway i can camp anywhere i like as long as it's more than 100meters from a house and that i leave the place cleaner than i found it.

It takes more effort to get out of the city, especially if it's only a short trip.

Yes, you can see northern lights in here, but mostly just in Lapland, the farther up north you go, the most likely it is to see them :)

And, what comes to camping, I think we have pretty much the same laws than in Norway, though 100 meters sound too little, I'd kick out campers if they were that close to our house xD