The hard winters of QC really jack up the cost of living to the point where it’s not really worth it compared to other options you’ve listed. Also, immigration is more difficult in Canada vs France, IMHO (Canada is pretty strict about “what benefit will you bring to the country from your citizenship?”). Granted, Guyana is probably cheap living, but it’s really difficult to live there without being fluent in French (many of the locals speak French as a second language; relying on English to communicate will be incredibly difficult when French is the unifying language there, not English). The entire département has less than 300K people living there.

France is by far and away the best European country to immigrate to if you want to explore overseas tropical territories!

Get to at least an A2 level in French before traveling there, with B1 being a stretch goal. France is really well laid out, and there’s almost an obsessive compulsive culture of labeling everything, so you can really learn the language by just walking around a major city and reading everything.

I’d imagine establishing residence in Paris would be the easiest way to go about immersing yourself, getting naturalized, and then moving on to wherever else. Remember, the tropical overseas départements are generally financially poor and lack opportunities even for locals. There’s a reason why there aren’t giant populations in these tropical places.