Mountain Travel Sobek has strung together an audacious globe-trotting whitewater odyssey that involves paddling six rivers on six continents in 25 days. It starts on the Class III–V Kings, Kaweah, and Upper Kern Rivers in California. Next up: massive hydraulics on the Rio Toachi and Lower Rio Blanco in Ecuador. Guests then pass through the Pyrenees on the Noguera Polleresa in Spain, scout giraffes from the Athi River in Kenya, and bisect a Himalayan pine forest on the Tons River in India. Sobek arranges all flights (and trains and helicopters) and ensures that when you finally arrive at each put-in, you get the ride of your life. May 9–June 2; from $8,695 plus (substantial) airfare.