Here are a few of mine:
Suction cups w/ hooks for the shower - we had bought these for our
Disney cruise and they came in handy last week for hanging up wet swimsuits (since they don't interfere with your shower like the clothesline does).
Pop-up hamper - another purchase for our cruise that works great for keeping track of dirty clothes (plus it folds flat for easy travel).
Liquid hand soap for the bathroom - this is something I normally don't buy, but I saw it at the grocery store the night before we left and bought it. Works better than the little bars and is great for rinsing dishes/cups.
Hand sanitizer, and lots of it!
Wipes, for cleaning hands or dirty tables
This is the first trip I wore a lanyard with the pouch (pocket, whatever you call it) and it made it SO much easier to keep track of my ticket, Fast Passes, photo card, etc. Will never be without it again!