Something I’m always surprised people don’t realize on Carnival ships: parts of the spa area are free for all guests.
You can usually use the sauna, steam room, gym, hot tubs, and the locker room showers without paying anything extra.
It’s a nice option if you’re tired of the tiny cabin shower or just want a quieter place to freshen up.
Just to clarify though, the Thermal Suites and some of the more upscale spa areas still require a pass or a Cloud 9 Spa cabin.