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.