I don't iron when not on vacation so it's not an option when on vacation! I do make the exception and iron everything I'm packing before I pack it. After ironing I fold a pair of shorts, a shirt and a pair of socks and underwear for each kid and place them in 2 gallon ziploc bags. Their clothes have never had a wrinkle in them and no searching for outfits for them to wear each day. The bags fit nicely on the shelves in the steamer trunks.
Adult clothes don't fit into the bags but careful folding and Downy Wrinkle releaser has been great to save the day. Gowns can be packed in the bags from the dry cleaners to prevent wrinkling while packed.
If you do choose to iron they have one available in the laundry rooms but you have to wait your turn and be careful that the iron didn't pick up a stain that can be transferred to your clothes.