I have just two quick comments.
Cruise ships are just giant cattle transports and anything that they can reach on a day trip, the herd will trample.
If a big dog like Carnival wants a place to park boats, it's gonna happen. They could probably buy the whole country if they wanted to. I know that a lot of other big projects haven't ever gotten off the ground in Belize but I have to think that Carnival is a whole different breed.