I agree Carol. If someone gets on a Cruise Ship with restrictions or lack thereof in one of the Ports of Call, the Port can change their restrictions before the Ship even arrives. That would be bad enough, but if you board the Ship and depart, then the City or Country changes it's restrictions while you are at sea, they might not allow anyone to exit the Ship when it returns, isolating everyone on board for who knows how long.
Wife and I got our first Pfizer vaccine on Jan 28th, and due to get the second one on Feb 18th. We used to take three or four Cruises a year (mostly out of our home port of N.O.), but haven't taken one since Mardi Gras last year. We are anxiously awaiting the time when Cruises start up again, but will certainly be hesitant to be the first to get one booked.
Our Mayor, has closed things down in New Orleans starting Friday the 12th, the weekend before Mardi Gras. No parades and no bars or restaurants serving liquor will be allowed to open until Ash Wednesday. Certain streets in the French Quarter will be barricaded unless you live there to prevent people from gathering. She certainly has put a crimp in the party time that visitors used to flock to the City for "the greatest free show on earth". Only problem is, neighboring places still plan on having some parades, so the people will just head there to spend their money.