At present the only accommodation on the island is at the Ministerio de Ambiente ranger station. There are four cabins (with a total of 40 beds), each with its own common cold shower and toilet. They are clean but spartan; given Coiba's isolation, you shouldn’t expect too much. You can also use a tent or a jungle hammock in the dry season.
Electricity is produced by a diesel generator that runs from dusk to dawn; use of the air-conditioning may be restricted. Be sure to pack insect repellent and toilet paper.