Discover geysers, bubbling mud pots and steaming vents in Yellowstone • Savor the sights, sounds and smells of this strange wonderland hiking from Biscuit Basin to Mystic Falls • Watch as Old Faithful shoots into action, projecting thousands of gallons of water more than 100 feet into the air.

Hike to the Grand Canyon of the Yellowstone, where waterfalls cascade over pastel-colored cliffs • Open meadows and stands of lodgepole pine lead to the canyon rim with a breathtaking look deep into the gorge.

Keep an eye out for wondrous wildlife, from elk to eagles, ospreys to otters and bison to bears • Kayak across Yellowstone Lake with local guides, taking in views of the Absaroka Range from the water • There's glorious hiking—whether you're up for 4 miles or 14—and a scenic boat ride to show off Grand Teton National Park, a paradise of wildflower-strewn meadows, shimmering lakes, thick forests and sawtooth mountains.

Bicycle along the base of the Teton Range on a paved car-free bike path • Explore Jackson, reminiscent of the Old West and once the crossroads of American Indian trade and travel routes • Raft thrilling Class II and III rapids on the Snake River with expert river runners.