Riding through the trees in deep snow is sort of awesomely terrifying. You have to try to keep your speed up so you don't sink and get stuck, but you also don't want to go too fast, because, duh, trees.
...you'd end up instantly stuck knee-deep. (When this happens, it usually means 10 minutes of digging yourself out and hopping over to a place where there's enough of an incline to get moving again!).