South of Bern and northeast of Sion, the Anzere Ski Area has 24 runs served by 11 lifts providing access to 52km of pistes with a maximum vertical drop of 920m. The ski area is very popular with intermediate snowboarders, and certainly families. It is a purpose built ski area dating to the 1960s.
Note: If you plan to head to Anzere 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, Anzere is the 33rd most popular snowboard & freeride destination of all 68 snowboarding resorts in Switzerland.