You can go on an ecological expedition to the Pantanal, Brazil.
You can go hiking and see wildlife on the river like:
wooden boardwalk in the rainforest of the Jungle along the Miranda River in the Pantanal Brazil South America
Other outdoor activities you can do include: boating, jeep safari, riding horse back, and fishing.
Paraguay River at sunrise
Waterfall at Chapada dos Guimaraes, Mato Grosso, Brazil is a must see.