Deer Valley Resort
I almost don't want to include Utah's Deer Valley on this list because of its long-held restriction on snowboarding (I've been riding for 23 years now). It's one of the last skier-only resorts left in the world. However, it's hard to ignore Deer Valley’s obvious commitment to sustainable operations. It is one of the participating mountains in the Sustainable Slopes Environmental Charter for Ski Areas, a program run by the National Ski Area Association. It recycles everything it can, feeds its organic waste to pigs, chooses local and sustainable food sources, and has an active program to designate and protect open space around the resort.