Granted, Arapahoe Basin is still teeny tiny compared to its sisters in the Vail Resorts umbrella. But this season marked the largest expansion of its sixty-year existence. With 400 acres and 36 blue, black and double-black runs, the opening of Montezuma Bowl made the ski area 80 percent bigger. Accessed by the new fixed-grip quad Zuma lift, the area is wide open, with lots of different terrain options — from soft bumps and moderate steeps to rocks and drops and trees. You can spend the whole day there and never go down the same way twice.