Ok, of course I have the regular stuff.., money, cell, lip-gloss, ticket, rm key, maps, schedules, camera, batteries, sunglasses, gum, snacks, water.., ect.
When it's cold I also bring gloves and a jacket. I have a jacket that rolls up really small but makes a huge difference when it gets cold or to put on for rides like Splash M.
Also, I buy poncho's at the local .99 cent store and bring those. (They are great for cold days and Grizzly Run)
I think what I have that is unique that really comes in handy is a small first aid "kit" I made it from a tin I have, it's just a little bigger than a deck of cards.., it contains:
Band-aids, (diffent types and sizes), neosporin, hand sanitizer, safety-pins (you wouldn't believe how often we seem to need those), ibuprofen, kid-tylenol, little alcohol wipes, a couple of aspirin (just in case anyone had a heart-attack.., yes, I'm a little over-prepared, but it makes me feel better.) Antacids, chewable pepto, immodiumD. Tooth floss.
We usually don't need to use the stuff (except the ibuprofen and safety pins tend to get used).., but when you need that stuff.. it sure is good to have. And when you just carry like 4 pills and use sample sizes, it fills in a very small space.
I also have an epi-pen because I have a bee allergy and I carry an asthama inhaler. I have never had to use either while in the park, but it's good to know they are there.
Oh yeah, and I always carry a couple of plastic bags. They are very small and fit in anything.., One year my DD started throwing up on the Mark T R Boat. We had no where to go.., all we could do was to help hold her head over the side. She was 11 and had no signs of being sick, and it just hit her. I think that can happen to anyone, especially kids, when you are traveling and the diet is different and the motion is rolling your tummy all around. And my son fell in a mud puddle once and we took off his top shirt and we had nothing to put the muddy shirt in. Some the plastic bags are now a must.
Just some tips.
Don't forget the chap-stick/lip gloss!