While we were there it was high 80's and sunny for 2 days, and then mid or high 60's and overcast for the other days. (During these days, I could pick out the locals b/c they were wearing down North Face jackets - I kid you not. )
Anyway, for me I had shorts and a tank top, with a zipable jacket over for the mornings when it was cooler. It was pretty much a zip up sweatshirt. I wore Crocs flip flops and Merrell Flip flops those were both so comfy. I didn't even bring sneakers! On the cooler days I had capris. I also have black hair and didn't do a hat (for some reason I never remember a hat when in SoCal, DUH!!), and it was fine. For me I would have brought a baseball hat.
DDs (ages 5 & 7) wore pretty much the same. Shorts/skorts, tank and jacket, or pants on the cool days. They wore crocs the whole time.
We had a stroller for 2 of the 3.5 days, and carried a backpack daily. Didn't do lanyards, but kept everything in our pockets of buried down deep in the back pack. I didn't trust the kids to carry their own tix, etc., and if we needed them for fast passes it was easier to have them all together.
Have fun!!!
"Every mother needs a wife." - Amy Poehler, Yes Please