Snake River, Wyoming
The Snake River meanders through Jackson Hole from its headwaters in Yellowstone and Grand Teton National Parks. Accordingly, the nine-mile Class III-IV canyon section is one of the nation's most popular stretches for whitewater rafting. With the upper Snake's watershed boasting 140 percent more snowpack than an average year, rapids like raft-flipping Lunch Counter will pack an extra punch this summer. It's also one of the best rivers in the world on which to learn how to kayak. Start your lessons on the mellow sections upstream of the canyon with Rendezvous River Sports, which offers single-day lessons or multi-day progressions in both kayaking and stand up paddleboarding.