One of the biggest tipping questions, however, is what should you leave for your room steward. Technically, there's no need for additional gratuity, but most people do leave their cabin attendant something extra.

A common trend for offering extra gratuities is a controversial practice among guests, but what does Carnival Cruise Line say?

Many cruise passengers form bonds with crew members. It's not uncommon for people to slowly build friendships over the course of a sailing, or multiple sailings, and then keep in touch with that crew member once they leave the ship.

"As the International Day of Awareness of Food Loss and Waste (Sept. 29) approaches, Carnival Corporation and its Italian cruise line, Costa Cruises, are sharing inspiring achievements and progress on food waste reduction goals that help support a more resilient food future," Carnival shared.