If you love the tropics, untamed nature and everything that comes with it, Suriname's interior is exactly what you are looking for. Suriname is a South American country that is known for its agriculture and is also the greenest country on earth with over 87% of untouched jungle. 
Kayaking through the jungle is oe of my favorite pasttimes.(
The beatifull rapids you see here are found at the Blanche Marie falls. Since it's an area not frequently visited by people, the air is almost 100% pure.