L.F.
I went to some sledding place in Big Bear about 10 years ago. I can't remember the name of it, but you could pay admission to sled down the hill on inner tubes. It was a lot of fun. And the best part is that there was a moving walkway that took you back up the hill every time. I would imagine that it could be pricey for a family of four at $25/person!
You might want to call your hotel and see if they have a hill on their property that you can sled down. Or see if they have a shuttle that will drop you off at a roadside hill. You can buy yourself a cheap sled or rent one and go back to your hotel room for hot cocoa when you get cold.