You can easily avoid wrinkled clothes by putting them in the plastic cleaner bags you get from the cleaners. I pack this way and it totally amazes me that therer are no wrinkles.
In case there are a few, some cruiselines do have irons and ironing boards for passengers to use, but it depends on what cruiseline. We were just on Golden Princess and they had a laundry room on every guest floor, with 4 irons and boards to use, very handy. What ship are you cruising on?
They all however do have laundry services that are about what you would pay at home, but it does add us.
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