*Sunglasses
*straps to keep our glasses in place on crazier rides
*ziploc bags for any manner of things...keeping phones dry, holding snacks, for stowing wet socks, whatever
*hand wipes or baby wipes
*blister care items
*Tylenol & allergy medication
*hair ties (which I will NOT be tossing off of Expedition Everest---man alive, I don't waste those things. i go through half a million as it is.

)
*inhaler
*the kids' autograph books
*(possibly) the kids' pins (if they don't want to wear their lanyards all day)
*small snacks for long lines
*sunscreen & Benadryl anti-itch stick
*tissues
*reusable straws
*a few small paper plates and a few plastic forks (in case folks decide they want to share a snack, or if they want to eat a snack typically served as walk-around food as a sit down snack)
*a thin washcloth or two
*ponchos or foldable rain jackets
That sounds like a ton, but most of it is pretty small, and I pack it all in ziplocs, with like items together. It makes security easier. Instead of pawing through 2 dozen loose items, they can look at 2 or 3 ziplocs and easily see every individual item inside of them. And the bag isn't very heavy, either. Now that my kids are bigger, we all share carrying the bag, which makes it all the nicer. (We just have to keep checking to make sure the youngest doesn't leave it behind anywhere on his turns.

)
(For our next trip, our older son joked that we should bring cup lids with us.

)
(ETA: Oh, and I keep a little post-it note inside each of the 2-3 ziplocs, so that when we get back to the room, it's easy to quickly check to see if we still have enough of everything packed or replace anything so that they are all set to go again the next morning.)