Tucked where the Upper Snake River Valley meets the towering Continental Divide, Keystone offers visitors a charming sense of seclusion. But in reality, this self-contained mountain resort is only 10 miles east of I-70 and Silverthorne's 90 factory stores, making Keystone an easily accessible mountain escape. With its Mountain Passport, Keystone makes it simple to sample all that a mountain summer vacation offers. (Buy one for $200 or book a lodging package and get two passports free.) Passports allow guests to participate in a number of activities. Pick from a mountain bike clinic, gondola lift ride with bike, guided hike, historic tour, wine appreciation seminar, a tennis or horsemanship clinic and much more. Want to learn how to cook a new dish or capture the perfect landscape image? Sign up for a class at the Alpine Institute. But what Keystone is most famous for is its golf. The Keystone Ranch Golf Course has been named one of the 50 "Must-Play" golf courses in the world by LINKS magazine. And new this year is the River Course, an 18-hole, par-71 course designed by 1997 Golf World Magazine Architect of the Year Michael Hurdzan. The par-4 16th hole will feature the nation's largest elevation change, with a 194-foot drop from tee to green. Good luck.