Dangers & Annoyances
The island has several tidal channels, known as furos (meaning 'punctures' in Portuguese) that connect inland lagoons to the ocean. They rise and fall, and even change directions, according to the tide. The one between Praia do Farol and Praia da Princesa (known as Furo Velho) is especially treacherous and should never be crossed on foot. Fishermen are usually around and can ferry you across.
Most hotels have wi-fi. There's also free community wi-fi, though finding a strong signal can be tough.
There is no ATM on the island or even in Marudá, and not all hotels accept credit cards. Best to bring cash from Belém.