For the uninitiated, it's basically snow tubing... without the tube. Not as much balance required as snowboarding, not as many pieces as skiing. Just you sitting on a board with snow blowing in your face.
It's even better with friends. Which is usually the only time I do it. There's nothing like a bunch of 20 somethings hitting up a hill on a cold day and acting like they're 5.
It's a rush. Plus, this winter has made things perfect. Just remember to wear a hat... and boots. Things go south pretty quick otherwise.