When in Lencois, Bahia, ask about Marcelo Luz at any hostel (preferably Auberge dos Duendes). He's known for his dog called Negona and has an absolute passion for the National Park. You will love him for his singing, his storytelling, his knowledge of Europe and philosophy and for his imperative to: "Always caca in the hole!"
His email:
cacainthehole@hotmail.com
Send your feedback or queries to been.there@guardian.co.uk
Search Been there
Your tips about Diamantina