One thing I enjoyed here the most is walking around. If it is short or long, just around or all over the park it is just fantastic to walk in this place.
Don’t forget, have the best shoes with you when coming here.
There is surely a way to get to Koli by public transport combined train/flight and local bus. Anyway, the best is to drive of course, the scenery is fantastic and you can visit all the small places and stop where ever you wish.
When you get to the ski resort, you cannot go with your own car all the way up to the hotel parking. That is reserved to the staff and facility vehicles. So you leave your car few hundreds meters bellow and take this unique elevator/funicular up the hill.