As far as most Pre-Workout supplements go all they will do is make you hyper for a little while, if you aren't used to using them, and then increase the amount of blood that reaches your muscles. This is really only useful if you are going to do strength training. For snowboarding it isn't going to do much more than make you dehydrated. Maybe a bit of whey protein and soy protein after a long day at the mountain to help the muscles rebuild but it wouldn't help to terribly much.
The best thing you could do is eat a healthy meal and drink water before and after. Also I would suggest taking a few moments every once in awhile to stretch out your muscles. This will help get the lactic acid built up in your muscles out and then also keep your muscles from tightening up. I usually find myself doing this on the lift while I am riding. It is kind of awkward at first but you can do some simple stretches while waiting the ride up.