Every year we go to my mothers, and every year she has to take down and put away anything that are breakable. And she no longer puts up an average size tree, only a little one. And still our cat managers to knock just about everything else off and play in the little tree. The tree we have at home is quite big and I have to make sure she can't tip it over when she climbs in it.
If you are wondering, yes we do take our cat on the 8 hour drive to my mothers.