Diversity of Terrain, Expansive, Tree Skiing, Cliffs, Goes on
Parking, Expensive Shops/Restaurants... (Essentially avoid the base area)
Whether you're learning, experienced, or a seasoned pro, Keystone has terrain for you. The mountain(s), runs, and features are sure to please any skiers and riders. And if you're into tree skiing, there is more than enough exploring to be done. I would go as far to say: "Keystone has the best tree skiing in Colorado". This is from my experience, but you can always find fresh tracks in the trees at Keystone in nearly any part of the vast acreage covered; as opposed to the trees that quickly become packed out at Breck, A-Basin and Copper (other nearby resorts).
Keystone really has nothing going on in the village, other than the price-gouging that is so typical of resort villages. Mind you, Keystone is owned by Vail Resorts, however it tends to be forgotten in the corporate turmoil that takes place annually (like an adopted child). For you, and us locals, this means a bit of freedom (at least on the week days) due to less marketing.
Keystone has the luxury of a corporate resort, with the feel of a local hill. Its a great mish-mash, and as long as you come at the right time of the year - (ice happens everywhere; try after February) you should enjoy it.