Great Adventure Cruises
Courtesy of Aqua Expeditions
As rain forests worldwide diminish, there’s no better time to explore the world’s largest remaining tropical rain forest, along the Amazon River. Daybeds on the observation deck of Aqua Expeditions’ 16-suite Aria Amazon let you observe the landscape as towering rubber trees, palms, and fig trees slip past. aquaexpeditions.com; seven-night voyages run year-round; from $6,615 per person.