I walked 40km in Lençóis Maranhenses, Brazil - and this is how it was! Hope you guys love the video, and if you're thinking about going, here are some useful info when you're there:
Price of the trekking in group p/p: $1,000 (or $200), and that includes the guide, the lodging in hammocks, and meals at the oasises
Transportation from SLZ airport to Barreirinhas was $90
You'll need a transfer from Betania (final village) to Atins.
The agency I spoke to was called LETUR and they also do the transfers!
