I just got back and I was very grateful to have brought (thanks to DISers):
--Moleskin/Molefoam - I got a really bad blister and used the molefoam for it. I also used the moleskin for ones that I thought might be forming.
--Bodyglide - I'd never tried it, but I liked it. DH even used it once or twice.
--BUBBLES!!! - This was wonderfully entertaining for the children when we were in some of the longer lines. If there was a cranky kid behind us, they perked right up at the sight of bubbles too. They are magic, I tell you.
--Pipe cleaners - We had some around the house, so at the recommendation of a fellow DISer, I brought some. At one meal, I was waiting at the table w/ the kids while DH was in a very long line. The kids were entering full meltdown mode. I gave my 4yo DD a few pipecleaners and she was so excited to be able to make structures/creations out of them. I think that 1yo DS was playing w/ the fan spritzer (see next)
--Fan spritzer (I bet you didn't see that coming) - we bought two of the small ones that can attach to your belt from
Walmart (in the air conditioning section). They had foam blades, so I had no concern about the children using them. DS was entertained SO many times w/ that thing. DD loved to spray us when she got bored. Loved. Them.
--Glow bracelets/necklaces - I picked some up at the dollar store before we left and each night that we were out, I gave DD a new one. She loved it. Since it was 6 bracelets for a dollar, I offered them to other kids around us too.
--ID badges for the kids - My kids were very good about wearing them. I felt so much more at ease with them playing in fountains and being out of the strollers when they were wearing them. On the badge, which was laminated and hanging by a lanyard on each child, was the child's name and picture as well as both mine and my husband's names, pictures and cell phone numbers. I heard a few people comment that they were a great idea too.
--That shoe holder thing for toiletries - I got it and didn't know if I would really like it. I loved it. I think I will bring it to other places in the future if we will be staying for more than a few days.
--Plenty of shiny pennies and quarters for penny pressing machines. If you like those, make sure you bring a lot. DD and I both got about 2-3 at each park. I needed to get more quarters a couple of times. They are such a cheap, yet great, souvenir.
That's all I can think of off the top of my head.