1. Snake and Columbia Rivers, Pacific Northwestern U.S.
You’re in pioneer country when you sail the Snake and Columbia Rivers in the scenic Pacific Northwest. Board a steamboat to retrace Lewis and Clark’s legendary route; many have onboard experts who’ll discuss the region’s history, culture and natural resources. You’ll see the majestic Columbia River Gorge and icy-cold Multnomah Falls, the second highest waterfall in the U.S. Book a jet boat ride when you reach Hells Canyon, the deepest canyon in North America, to look for Native American pictographs and watch the landscape change from high desert to alpine forest.