South of Zurich and northeast of Andermatt, the Sedrun Ski Area has 9 lifts accessing 50km of marked snowboarding pistes. While those snowboarding runs are narrow and poorly groomed, the main attraction here is the freeriding off-piste action where the lifts provide access to powdery ridges and untracked valleys.
After a long morning of snowboarding Sedrun, check out the Restaurant Sudada near the base lift. For apres ski action, you can try the small mid-mountain Las Tegia Palias, which offers an amazing view.
Note: The only lifts in Sedrun are a couple of small lifts. But, just west of Sedrun, there are lifts leading up to Gotthard Oberalp. And, if you hop on the Matterhorn Gotthard Bahn and take it up over Oberalppass, you will be in the heart of Andermatt quickly. There is a combined lift pass for the entire Gotthard-Oberalp Ski Arena.
Note: If you plan to head to Sedrun for snowboarding by train, here are two great options offered by the Swiss train system SBB. First, there is the discounted Swiss Transfer Ticket which provides a round-trip train ticket from an airport directly to the town near the ski area, plus 50% off any additional train or bus tickets. Second, there is the Snow-N-Rail ticket which provides a round-trip ticket from anywhere in Switzerland combines with a ski lift pass for as long as you need at a total 20% discount (see: http://www.sbb.ch/snownrail ).
Overall, Sedrun is the 27th most popular snowboard & freeride destination of all 68 snowboarding resorts in Switzerland.