Southeast of Zurich and southwest of both Chur and Laax, the Vals 3000 Ski Area has ten pistes served by 4 lifts with a maximum vertical drop of 1,750m. Most of the pistes range from moderate to difficult. There is also plenty of freeriding option near the groomed slopes, such as Zerfreila. The town of Vals makes a great base for exploring the snowboarding at Skigebiet Vals 3000. There is regular bus service to Vals from the train station in Ilanz to the north.
Note: If you plan to head to Vals 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, Vals 3000 is the 23rd most popular snowboard & freeride destination of all 68 snowboarding resorts in Switzerland.