You have to build up your lactic acid threshold. Maybe pick up cycling in the snowboarding off-season, 15+mph on road or 7+mph mountain biking. It's my first year riding (snowboard) but I have been a longtime cyclist and have had little to no issues with my quads/calfs.
Other than I have really been wanting to snowboard for a long time, the main reason was to keep my legs working out in my off-season (mountain biking). It just makes it better that I have become addicted to snowboarding as much as biking.
maybe ill start to hit up the bikes at the gym instead of the treadmill and see how that goes.. what you said about lactic acid kind of makes sense... when i first started to lift i had really bad muscle burn, drinking a lot of water during and after kind of seemed to help.. thanks for the advice..