Snowshoes.

We got snowshoes for Christmas.  We tried them out in the foothills near our house.

 They worked great and we had so much fun.  There were deer tracks everywhere.

We were above the inversion layer where the nice, clean air was.  Ahhhh.

We will be doing this a lot this winter.  Dave read that you burn 600 calories an hour while snowshoeing.  But even if I didn't burn a single calorie, I would still do it again.