Tornado Chasing across the Great Plains Race into cat and mouse suspense chasing the world's most violent weather during a meteorological dodgeball game. Cloud 9 Tours 405 447 3171 Website Ice Climbing in Ouray's Ice Park Step gingerly into the yawning throat of a frozen gorge coated with nine-storey icicles. San Juan Mountain Guides 970 325 4925 Website Lava Trekking at Hawaii's Kilauea Volcano Hike into a methane gas death zone of exploding trees where molten flows sizzle and create a new landscape. Hawaii Volcanoes National Park 808 985 6000 Website Snorkeling with Spawning Salmon in British Columbia Cruise an out of body experience floating with waves of spawning salmon on the Campbell River. Paradise Found Adventure Tours 250 287 2652 Website Canyoneering into the Colorado Plateau Squeeze through claustrophobic fissures and down into an unseen sandstone world of undulating walls. Bureau of Land Management 801 688 3230 Website Land Yachting across the Mojave Desert Sail through an endless desert basin with screaming runaway gusts on your precariously teetering wheeled contraption. U.S. Manta Association 805 264 4270 Website Mountaineering in the Bugaboos Pick your way through hazardous glacial edges and vertiginous drops to reach jagged summits with rope and ice axe. Canadian Mountain Holidays 403 762 7100 Website Rowing a Dory through the Grand Canyon Navigate through turbulent maelstroms of churning water between the craggy gorges of the most spectacular canyon on earth. Grand Canyon Expeditions 435 644 2691 Website Ice Sailing on the Hudson River Fly across tide warped floes as frigid wind gusts power classic ice yachts and yank the tears from your eyes. Hudson River Ice Yacht Club 914 876 6087 Website Goat Packing through the Escalante Wilderness Saddle up the livestock for a backpacked animal train that scampers the unexplored soaring cliffs and petrified dunes of Utah. Wind River Pack Goats 307 332 3328 Website