Also try Hoch Ybrig.

http://www.hoch-ybrig.ch/index.cfm?s...age=142&lang=D

My nephew recently visited and he learnt to snowboard there. Took him 3 days to pick it up without lessons. I also sent them to the end of Grutstr. in Oberiberg, above Hoch Ybrig. There's a big car park and lake right at the end of the road and they could practice there on a small slope without buying a lift ticket.

http://map.search.ch/oberiberg/gruetstr.