Stop in for a cup of coffee

How that work with the covid crap getting into foreign ports?
Some islands are still off limits, some you have to quarantine for 14 day, some you have to just provide a negative test result with in the past 72 hours. As an example once you gain access to say the French islands, then you can travel to and from all the islands with no issues. The second you visit a non French island then you have to start all over.