Not needed for 90 days for most nationalities.
Passports are obligatory for all visitors except those from France, who may travel on their national identity cards. Visitors must also have a yellow-fever vaccination certificate. Australian, New Zealand, Japanese, EU and US nationals, among others, do not need a visa for stays up to 90 days.
Those who need visas should apply with two passport photos at a French embassy and be prepared to show an onward or return ticket. Officially, all visitors, even French citizens, should have either onward or return tickets, but this is rarely enforced.
Visas for Onward Travel
Visas are required for nationals of many countries entering Brazil and Suriname, so check ahead of time.