Well, for French Guyana some factors avoided independence of that territory:
1- Late colonization: French Guyana started to really receive non-native people in the late 19th. Century, much later from early 19th. Century Latin American independence movements and in a era when communication links with the French mainland were much better, avoiding the giant gaps that where developed between Latin American colonies and its metropolis in early centuries, that helped to those future countries develop a proper culture. As said before, arriving later and keeping closer ties with Paris, French Guyana population feels as a part of the French élan.
2- Lack of social-economic links with its neighbors: French Guyana is located in a remote corner of South America, with precarious links with Suriname and the almost inhabited and poor Brazilian state of Amapa, so almost all French Guyana economy is dependent of France.
3- Why independence? Being a colony, French Guyana is part of the European Union and receiver of generous aids from France, in a much more comfortable and stable position from its neighbors (Guyana is one of the poorest countries in South America, Suriname is a drug cartels heaven and Amapa (the Brazilian "Guyana" is trying to build its first paved highway since the 1970s)
3- Low population: With a population of 200,000 habitants,