This week, Travel Today with Peter Greenberg comes from the Sonnenalp Hotel  in Vail, Colorado. A look at Vail with historian John Horan Kates, ranging from World War II mountain military training to President Gerald Ford..and beyond. And a look at the work in the Steadman Philippine Research Institute, on the importance of (and the proper approach to) aerobic exercise when you travel, especially at high altitudes. There’s all this and more as Travel Today with Peter Greenberg comes from the Sonnenalp Hotel in Vail, Colorado.