Be prepared for the weather!! This means hot, humid, rainy, sunny or cool.
Things I recommend you have to be prepared:
-Light weight jacket for rides or restaurants with high AC
-Water bottle (stay hydrated!!)
-Rain poncho- Dollar store specials or heavier version, your choice. You can also purchase them at Disney
-Cell phone and back up power pack
-Gatorade individual packets to add to water
-I carry Shakelee green tea energy chews when really hot
-Basic medicines (Tylenol, Advil, Dramamine, Anti-diarrheas and Benadryl
-Extra socks
-Cooling towel
-Sunscreen
– Lanyards with pins
-Patience
I recommend a small backpack to carry things. IF you use a big one it tends to get filled. You can carry the small back pack with you onto the rides.
Be prepared for your days in the parks to have a better day in the parks. For more great tips check out this article. Disney has one too. Be prepared!