Since in the Netherlands there ain't mountains, when not in the Alps, I go snowboarding indoor. In "flat" europa there are several indoor-slopes, and I know it's by far not as good as the real thing, you still can have a lot of fun. The one I go for example has the biggest indoor funpark of Europe, containing several kickers, rails, boxes and a stairset.
Does anybody else ever go snowboarding indoor? Are there actually indoor-slopes in the US?