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!