Replying to Skiing Japan...Need help

I am on this thing for college called a semester at sea...which by the way you should all check out if your still in school. You get school credit and you get on a cruise ship for a semester with 700 other kids and sail around the world. Anyways we are stopping in southern japan at the end of april and i was wondering if there was good skiing down there, or about how much it would cost to fly north for a few days? Thanks for all of your help!