Keystone’s A51 Terrain Park, which boasts 60 acres of awesome terrain, over 100 features for every ability level and a dedicated park lift, is known as one of America’s best terrain parks. Start small and then progress to the 60-foot jumps. Watch the pros practice and discover new tricks. This is big stuff, so be sure to know the terrain park etiquette before entering, and know your own limits so you can stay safe. To enter the park, purchase a lift ticket and ride the Peru lift up from the Mountain House base area.