During my recent hike in Shenandoah National Park along the Appalachian Trail, I came upon a tight crook in the trail that carried Ivy Creek downhill amid a flurry of gold, red, orange and yellow leaves of fall. There can be no more spectacular setting that the hardwood forests of the East. Unless it's set ablaze by the pastel daubs of spring wildflowers in places such as Glacier, Saquaro or Canyonlands national parks.