Irons are not allowed, fire hazzard. Hang clothes on hangers, cover with dry cleaners bags and pack in your garment bag. Unpack as soon as your luggage gets to your stateroom. Steam out wrinkles in the shower, use a portable steamer, wrinkle release spray or use the ships pressing service.
It's called Downy Wrinkle Releaser and I've found it in the laundry detergent aisle at both the grocery store (Kroger) and in Wal-Mart. It's a white spray bottle with blue and pink lettering.
Last week I found a "travel size" at Wal-Mart in their "travel size" area near the pharmacy.
I HATE to iron, and have found this works very well!
"A truly happy person is one who can enjoy the scenery on a detour."