The identity card is enough for those who are confined to the French territories. A current valid passport is preferable to go to the next English-speaking islands and, in this case, you should theoretically have a return ticket or continuation of the journey.
Routine controls, but notably more common for those returning from free ports as san-Martín and Saint-Barthélemy (attention to the cameras and other electronic devices).
Weight and Measures
220 V 50Hz
Mail works well in the West Indies. However, if your shipment is urgent, use Chronopost.