As the snow melts, Vail's Adventure Ridge swaps out tubing, ski biking and a kids' snowmobile course for zipline tours, a climbing wall, a primo disc-golf course and other activities. The best of these is a pair of ropes challenge courses. You'll start with a ground-school lesson to make sure you know how to operate the can't-fall, can't-fail harness system, then spend thirty minutes up in the air on the North Course or sixty minutes on the more challenging South Course, quivering in that harness as you attempt to traverse a series of increasingly difficult obstacles. Don't sweat it when some adventurous little girl shows you up. Happens all the time.