Leaving Barreirinhas in a 4 × 4 vehicle that will take us to one of the ferries to cross the Preguiças River that gives access to the Lençóis Maranhenses National Park (PNLM), the park has approximately 155 thousand hectares. The trail takes an average of 1 hour, longer than the Lagoa Azul Circuit, but no less fantastic. In front of the Dunes there are support points where the cars will be parked, along with a guide we will start a 20m climb to have access to Lagoa Bonita, right at the beginning of the hike. After that climb, your tiredness will no longer exist, as you will be impressed with so much beauty. Free time for sunbathing and swimming.