Hafjell has a sweet park, but it's next to impossible to find powder there. (The trees are too close together). I recommend Hemsedal, they without a doubt have the best and most accessible BC in Norway, and they've upped their parkgame this year, however, if you're really into rails, Hemsedal is not the place. Trysil is a good alternative, alright BC, and a sick park.