International Expeditions is offering cabins with no single supplement fees on all 2015 departures of its two most popular river cruise programs — Amazon Riverboat & Lodge tour and Amazon Voyage.

On the Amazon River, guests travel aboard the 31-guest La Estrella Amazonica, enjoying numerous wildlife sightings. Daily outings on this 10-day adventure take travelers deep into the Pacaya-Samiria National Reserve to spot diverse wildlife, hike into the rainforest and even fish for piranha. During excursions into the narrow river tributaries, guests may spot more than 100 kinds of birds, pink and gray river dolphins, sloths, giant otters and nocturnal animals such as caimans and capybaras.

Amazon cruise passengers also spend time with Ribereños in remote river villages, handing out school supplies to children and meeting with a local shaman. Ensuring a high level of authenticity, IE varies the villages guests visit during their Amazon expeditions.

IE’s new seven-day Amazon Riverboat & Lodge option combines three nights on the river with time at Ceiba Tops, a luxury rainforest lodge, where excursions include a stop at Monkey Island Reserve and a guided tour of a canopy walkway.

Solo travelers make up 21 percent of all passengers in the Amazon on International Expeditions.

See River Cruise Advisor’s Solo Traveler’s River Cruise Specials for more special offers for single travelers.