I decorate my parents house as soon as i get there!
I'm usually home about a week and a half or two weeks before christmas. I'm the only christmasy person in the family so i set up the tree and do all the decorating inside, and I go outside and do a lot of work out there, but I have to get on my dad's case to put lights around the roof because he doesn't want me up there. Then I go inside and make a fire and drink hot chocolate or apple cider all by myself and look at all my work lol
Oh and I also listen to christmas carols the whole time I'm doing it! Everyone else just thinks I'm crazy.