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The most common offer sails clients from the Port of Atins to the mangrooves on the east side of the shore (10 min away), where one can walk around, pick up fresh cashew fruits if in season, and see the ocean. Shortly before sunset, people congregate on a little dune and wait for the red ibis to fly over their heads. It's common to then hop on the boat to watch the sunset from the water (but honestly that's a bit pointless since the view differs very little from the one that can be seen everyday for free from the beach). Compared to the similar tour done on the Paraíba delta region, this one is nice for the increased sense of proximity with the birds, but the flocks are much bigger on the delta. Local fishermen might offer to take you on this trip if you linger on the beachfront long enough - that's a great deal since for the same price you will have a private tour and can choose exactly when to move.
Virtually the only activity available in Atins that's not water- or sand-related