If you want somewhere snowy and in Europe then I know a few people who go skiing over christmas, usually to the Alps, either Switzerland/Austria/France etc.I have a chapter coming up where I need a British wizarding family to go on holiday for Christmas. I need an idea for possible places that the British jetset might go for Christmas. Locations in other countries of Europe would be prefered.
If it's for the Malfoys, I can't quite see them going to lapland but I could imagine them in a very expensive ski resort.
Other than that I can't think of anywhere my friends might go that hasn't been mentioned.