I think if you search the site, you will find that quite a lot of us have, at some time or other, taken the riverboat/s from Belem to Manaus. For me this was a great experience, 6 days, banana-shaped, in a hamaca. The road out of Brasil via Boa Vista and thence to Santa Elena can be a little lumpy in parts, but it's plain sailing through Venezuela, (if they now have bridges), and Colombia as far as Cartagena.
How much does a man live, after all?
Does he live a thousand days, or one only?
For a week, or several centuries?
How long does a man spend dying?
What does it mean to say “forever”? - Pablo Neruda