This is my plan for paying my onboard bill - but I want to make sure it's ok. I want to allow charging to the room - and then at the end of each day go up and settle it with cash. Can I do that? I don't want to just hand them all my cash at the start of the trip - if there's any leftover I want to bring it home. That way I also have cash on hand for RS tips & to take for excursions... Are there safes in the room?