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The formal night varies. You won't be out of place if you are in a suit, but there are people who wear a tux. Carnival is a nice line, but it's not on par with say, Cunard, where you would be out...

Lucky you!

I've never cruised on Carnival before, but I've been on Royal Caribbean, which has most of the same excursions and features.

As for what to do on board, there will be a variety of...