They both sound fun but since I haven't been skiing in years I would pick skiing and watch the game on the tube. That's just me though. Good luck choosing!
The ski resorts in Colorado have gotten very little snow. I know there is a few weeks in December, but there might not be very good skiing in Steamboat this time of year.
I boarded at Breckenridge over Thanksgiving and despite only having one run open, the snow was a lot better than I was expecting. They finally got a decent snow last week and sounds like there could be a lot more coming this week.
Steamboat will still be there next year, and for many years after that. We might not be playing in Nashville again for a long time. I would choose the bowl game.