Remember kids... always wear a helmet. (The almighty bikeradar helmet thread)

Here's the weird thing - I would never consider wearing a helmet while skiing, but would not go without one when snowboarding.

For me it comes down to the likelihood of landing on my head - This has never happened in 30+ years of skiing, but happens every few days of boarding.

I'm quite into wearing a helmet when snowboarding, not because I feel very much safer, but because it keeps my head warmer than a hat. Unfortunately the same doesn't apply when cycling.

Incidentally, you stop falling over when you've finished learning how to snowboard. You probably fell over quite a bit 30 years ago when you were learning to ski, too, but time heals all wounds and all that.

EDIT: I hope you are still learning and I'm not patronising you here...