Amazon, heart of the planet, you'd think it's an instant 5 star visit... Not so much. The inscribed areas are rather poor, especially the ecological centers where they feed dolphins as a tourist attraction. To truly enter protected areas you will need to take a boat cruise into Jaú National Park. That means taking a 3h drive from Manaus, then traveling further in for at least a day and finally reach the ranger station.

The cruises are also super tourist driven, so I can't recommend them. Macaw watching, cayman catching, piranha fishing, visit to ruins (read: rubber baron remains, not exactly native) and shopping with a local tribe: Portuguese immigrants, not indigenous at all. To get anything more you will need to find a deep trekking tour instead and while I'm sure the Amazon is great, other places to see them are much better visits.