A group of us are going to Breckenridge Feb. 28th - March 4th. If I purchase lift tickets in advance through the Breckenridge Resort website, am I able to use one of the day passes to ski in another Vail resort (Keystone, Vail, Beaver Creek)? Also, is it possible to ski during the day In Breck and then use the same pass to ski that same day at night in Keystone? Your help is greatly appreciated!!