No, it's not a stupid question. Irons in your cabin are a BIG no-no
. They are a fire hazard and not allowed.
You can bring a clothes steamer. I also like the Wrinkle Release spray. Also, if you pack everything in dry cleaning plastic bags, it will keep the wrinkles down.
Or you can do what I do. I take mostly knits, so I don't have to iron
I haven't sailed RCL, so don't know if they have laundry rooms on board, but you can send things out to be pressed.
Have a great cruise,