We always have bug spray so we don't get bitten by mosquitos because I hate, hate, hate bug bites! Hate them! But, I always wind up getting bit, so we take Skeeter Sticks along with us too.
We also make sure we have sunglass holder stappy thingies (does anyone know what I'm talking about?) since we're always in and out of buildings and rides, so we don't lose our sunglasses.
We have a hard case for our room keys that we wear either around our neck or attached to a belt so they're handy and we don't have to dig for them.
We also carry a travel sized hand sanitizer and gum. Lots and lots of gum because they never carry the kind Mike likes. And chapstick.
If you plan on sending in your photos to snapfish, you can also bring your snapfish film envelopes along, and when you finish a roll, you can send it in right from the hotel in their postage-paid envelopes. That way, some of your photos could be waiting for you online when you get home.