Taxis to São Luís leave as soon as they are full, 3-4 hours, R$ 140 (4 people). Many in the morning, few locals will ride along after dark. Note that a taxi can take considerably longer than a bus depending on where your fellow passengers want to be dropped off.
Four buses a day from São Luís from the Rodoviaria, 06:00 AM - 08:45 AM - 02:00 PM - 07:30 PM, 4 hours 1/2, 29 R$, Cisne Branco company.
Beds in the center are fairly expensive, with some exceptions:
Pousada Gomes, (Around the corner from the Mototaxis). Very basic, shared bathrooms.Single R$ 10. edit
Paraiso do Caju, Rua da Primavera (Riacho (Sitio da Fatima Correa)), ☎ (98)9162 4036 (firstname.lastname@example.org), . Cosy Pousada with very helpful and warm hearted team, leaded by the owner Patricio (speaks English). You can also book tours to Lencois here for a reasonable price.Single (Dorm) R$ 35,Double R$ 80, Tent R$ 25, Hammock R$ 20 - all including breakfast. edit
Pousada do Porto, (Riverfront some 300 metres upriver from the boardwalk.), ☎ +55 98 3349 1910. Double with fan R$ 40. Also air con.. edit
Pousada Belo Horisonte, Avenida Joaquim Soeiro de Carvalho (Next to bus station). Overpriced.Single R$ 50. edit
Posada Lins, Avenida Joaquim Soeiro de Carvalho (By the mototaxi stand). Bright and clean, spacious bathrroms, courtyard with small pool and hammocks.Single R$ 60. edit
Pousada Lagoa Bonito is at the top of the sanddune where there is a great view of the marina ..... double with fan and good breakfast for R$40.
Many agencies offer trips to the dunes, mostly leaving at 9 AM or 2 PM, returning 5 hours later, R$ 50 per person. A bumpy ride of an hour or so takes you to either Lagoa Bonita (reportedly better views) or Lagoa Azul, where a guide will walk you around. In theory it is possible to do both sites in one day, but this requires a special arrangement with some agency, as the trip proves too exhausting for most mortals. The afternoon might be preferred due to weaker sun, more shadows playing and a chance to see the sunset.
Another daytrip on offer is with a boat down the river Preguiça, to Atins, Mandacaru and/or Caburé. Unless you are in a hurry, it is recommended to stay overnight, or use one of these places as a stopover en route to Paulino Neves or Parnaíba.
Four buses a day to São Luís, 06:00 AM - 09:00 AM - 02:00 PM - 06:30 PM, 4 hours 1/2, 28 R$, Cisne Branco company.