I have never been to Brazil, so I can't advise you on exact places to go. But Darwin
did visit Brazil, so maybe in the interest of having a good story to tell when you return, you could try and find places he's been to. Sort of like a secular pilgrimage.
Currently, I am reading a biography of Darwin by Adrian Desmond & James Moore. I bought it in Down House, Kent, where Darwin lived and wrote The Origin. That's the kind of pilgrimage I have in mind, but grander.
Just a thought. Have fun in Brazil.
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