I have always taken a small travel iron on cruises. No one has ever said anything to me about it. But oddly enough, I never seem to use it. I realize it probably could be a fire hazard, so next time I think I'll just leave it at home.
i have found if you place clothes that will wrinkle easly in the bags(covers) from the dry cleaners, they will not wrinkle as easly. it lets the clothes slide easier. besides you are on vacation with other people with wrinkled clothes.