Aqua Expeditions’ Aria Amazon takes guests deep into Peru’s Amazon Jungle, from Nauta up the Maraňón River – a tributary of the Amazon – and into the Pacaya-Samiria National Reserve in the heart of Peru’s Amazon jungle. It’s a sleek glass-and-steel capsule containing 16 design suites that overlook the jungle vista through panoramic windows. There’s a Jacuzzi on the observation deck, where you can seek relief from the equatorial humidity while sipping a cocktail and scanning the river for signs of its legendary dwellers; or you can immerse yourself in this seething, steaming mesh of wilderness on the many excursions included on the cruise itinerary.