Mandacaru
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Get in
Boat to Atins and Barreirinhas once a day, R$ 5. Negotite a fare with any boat at the pier. You can walk to Atins in about 1,5 hours.
See
Mandacaru LighthouseClimb the 163 steps of the lighthouse to get quite a view
Eat
No real restaurants, but any of the bars should be able to serve you a cheap set dish around lunch.
Sleep
Ask for a private rom or a hammock.
Go next
Just a few hundred metres away is the village of Bar da Hora, perhaps unique on the planet in being named after a bar (now closed).