Just that everyone I know who did a Carnival cruise, said it sucks. Not to mention all the problems they've had years ago. @Red
Hahahahahaaaaaa I'd blocked out that memory due to trauma. LOL. The food was absolutely the cheapest slop you could serve, the people were profoundly unaware of their surroundings/lacked any kind of politeness.... the "destination" trips you could purchase for excursions outside the boat were ALWAYS funneled through the most thinly-veiled tourist trap/shopping centers so people would buy their local shit (or booze or cigarettes)... it was maddening.
Then there were the upsells: Think you're buying a 6 hour excursion to the local marina with sea turtles? Subtract an hour drive there & back (okay, okay, that's acceptable) then add in all the F*cking stops at the tourist-kitch-sell-shacks, then bathroom stops (also where you can buy things) & you end up with a 45min tour of the marina life conservation center. We were pissed. I think we got refunded for that one.
Add to that choppy seas, a shitty gym that's neglected machines were from the 80's & just overall dissatisfaction with the whole thing, both of us agreed to never do an ocean cruise again. Ever. We couldn't get off that boat fast enough. Which reminds me, we were delayed into port due to fog. F*cking FOG. We missed our flights out that evening (we figured 12+ hours was enough of a cushion to allow for delays, we were wrong).
Never. Again.