What to bring into parks:
-Bring in a small backpack, or cross body bags, those tend to work well
-Sunscreen
-Wallet with essentials in it (mmyw card, debit/credit card, id & cash, dont bother bringing anything you don't need)
-Camera
-Phone if you want it (and in my opinion, a Iphone takes better pics than some cameras)
-Tylenol
-Gum (they dont sell it in the parks)
-I usually bring a sweater at this time of year, you might want it in the evenings
-Sunglasses
What to wear:
-I usually have shorts & a tank or tee shirt on and put the sweater on at night.
-Capris would also work pretty well
Other tips:
I don't know what your schedule is like at all, but try to take advantage of some Morning EMH, they're the greatest thing in the world, and not crowded at all
-Figure out what the top 3 things in each park are that you have to do, and make a plan to get them done.
Example: in AK, I MUST ride Everest, see Festival of the Lion King & go on the Safari. So, I make sure I hit up rope drop, I go on Everest (usually twice in a row) then grab a FP for it, head over to the Safari, maybe grab a fp for it, back to everest, then over to the first showing of FOTLK
-When you're in MK, start in Adventure/Frontierland, and go clockwise through the park. Way less crowds. That being said, make time to swing past Peter Pan's flight and grab a FP for it before Frontierland or you'll never get a low wait time on it
-Take a break midday if you need to. That break can be anything from a sit down lunch, to sitting on a bench with a diet coke, to pool time, to a nap
-Be prepared to not get everything done.
-If, in DHS, only 1 of you wants to do RnR, send the other person over to Toy Story Mania to grab the fp's (make sure they have BOTH person tickets) while one person goes single rider on RnR
-Go to the left when there are 2 lines.
-Also, most counter service resturants have lines on BOTH sides of the tills, be sure to utilize them.
-Are you on the dining plan?
-Pre pay for the photopass cd, it's TOTALLY worth it!