Our ecological trekking consists of an initial 07km walk inside the restinga forest, located around the dune field of the Lençóis Maranhenses National Park. Following the first objective, which is to reach the dune field, we take advantage of the lagoons in the Lagoa Azul region, to then walk through the dunes for another 13km, visiting the Lagoa da Prata region, and exclusive lagoons, before reaching our second objective, the region of Lagoa Bonita, where we can contemplate nature, have lunch at the Nativos house, watch the sunset, and then return to Barreirinhas, using public transport for tours. Our scheduled time to be back in Barreirinhas is 7 pm.