Laveccha, irons aren't allowed on the cruise ships. I'd suggest bringing a portable steamer like my family. On the first day just steam everything and after that you don't need to do it anymore. It's a cruise, have fun. People don't pay that much attention to wrinkles.
2006 - Mariner of the Seas
2009 - Independence of the Seas
2010 - Liberty of the Seas
2011 - Navigator of the Seas
2011 - Jewel of the Seas