Does the school want a list of what is educational about the cruise so they can check that funding box, or does it require a report afterwards on all the topics they studied and how?
There's writing
something down that will make the bureaucrats happy, and there's trying to wring something meaningful from every aspect of your family vacation then writing an after action report on it.
I'm a firm believer in "all of life is an education" but let's be honest - the average
DCL Caribbean cruise, with beaches, cheap t-shirt stands, and character meet and greets, is not overtly teeming with education. And while there is a LOT you could learn about the ship, the vast majority of it is inaccessible to cruisers unless you continually hound every CM you see. I think presenting it as a significant educational activity (over and above counting the rows in the local movie theater instead of going to school that day) is trying to make a silk purse out of a sow's ear.