Make it as simple or fancy as you want, so long as it fits in your suitcase!  Do make sure it doesn't require anything that TSA or the cruise ship might consider a weapon ;)

If you're going with friends, pick a theme - there are often prizes involved!

Hiding ducks around the ship is more than a fad at this point, so pre-costume your ducks and make the most of it.

Bring your magnetized or nonstick decor to make sure your cabin door gets to be part of the fun!

You've got the costume, but think about having a whole theme for the week, whether its accessories or a BooCruise tshirt!

If you don't have to get the little ones back for trick-or-treating, think about celebrating Halloween Night in Miami!