The Colorado River has been the lifeblood of the Southwestern desert for centuries, and today there's a wealth of history along its banks. Yuma River Tours (tel. 928/783-4400) operates narrated jet-boat tours from Yuma to the Imperial National Wildlife Refuge, as well as a 48-mile trip upriver to Draper. Along the way, you'll learn about the homesteaders, boatmen, Native Americans, and miners who once relied on the Colorado River. Tours cost $38 to $89. 

Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.