Terrain parks seem to get bigger and badder with each passing season as ski resorts try to find new ways to attract the snow-bro crowd to their lift lines. Colorado certainly has no shortage of Olympic-sized Superpipes, big air jumps and rainbow rails for the young and the reckless to choose from. But sometimes girls and guys just wanna have fun, which is why Keystone's A51 takes the cake. Voted among the top in the nation by both Transworld Snowboarding and Freeskier magazines, A51 balances the heart-pounding mega-features against an assortment of smaller offerings such as wall rides, spine-ramp boxes and culvert tubes. The layout maximizes flow, giving riders more bang (and fun) for their buck.