It's important to remember that in general the boat and the crew are separate issues. Many countries have limits on the boat related in import
and export laws and taxes
. A boat clearance out of one port with the next planned port is often required and most countries have rules regarding how long a boat can stay before being subject to import
The crew requirements are related to country of origin and destination
. Many countries allow visa on arrival for US citizens. The fact you are arriving by private yacht rather than a commercial
shipper is largely irrelevant.