[Resort Advice - Nearest to Tokyo?]

Sorry - should have specified.

Just day trips.

[Resort Advice - Nearest to Tokyo?]

Hi - newbie here.

I'm heading to Japan for a week mid January, and I have a JR Railpass. I want to spend a couple of days snowboarding while I'm there but I'm having trouble working out what is the closest resort/mountain to Tokyo.

Can anyone advise me which is the best/closest/easiest to get to by train/ resort to Tokyo?

Thank you in advance!