Sorry, but I wouldn't touch ship craps. I'm used to Vegas odds. I love craps, but with 2x odds and $5 limit, you're looking at huge losses. Unless you just do 6&8, which I don't do.
There was only one person playing craps on the Carnival Spirit when I went, which also leads to a boring gambling night.
The Pride only has one craps table and it is hard to get on it if you're not in the casino early.
I was on the Fantasy one time and had to explain to the dealer what the odds and payoffs were on some bets. I was the only one on the table. Don't know why some ships have lots of craps players and others don't.