I do not handle authority well and my wife is a lot more tolerant of indifference and "attitude" then I am. Therefore; in our three years of cruising in the Eastern Caribbean, she was the Captain that checked us in and out...20+ times. All without a hitch. I would still be in jail in Antigua if I had to check in with the guy with the long pinky finger nail; but that is another story.

>>>>"I would still be in jail in Antigua if I had to check in with the guy with the long pinky finger nail; but that is another story."<<<<<
- - Hey, don't disparage those guys, just smile with the knowledge that they are no longer in the "gene pool" game.

All the above is good advice! I spend most of my time shuttling between the nations of Grenada and St. Vincent and the Grenadines, so I make up several copies of the required documents for each country already filled out with information that won't change, such as boat size, make of engine, etc. Thus all I have to fill in each time is any changes in the crew list. Saves a lot of time and duplication of effort.
Above all look respectable, be courtious (you are a guest in their country after all), be patient and don't be afrade to ask for clarification if you don't understand something.
BTW - if you're in Tyrrel Bay on Carriacou, look me up!