Ok... this might be a little long and winded but I am so glad I finally found this thread. My hair is not the easiest to handle even at home. I find that I do it and then once I am out the door, it looks like someone else's hair... but here is what I do.
Normally at home, I just get out of the shower in the morning and blow dry it until it looks like how I want it. BUT... when I have to go in Florida weather... this seems to work. My hair is chin length so I have to deal with flipping out ends, etc.
WASH YOUR HAIR THE NIGHT BEFORE! Maybe you do already, but I usually shower every morning so it is different for me. When it is still wet, I put in "Garnier Fructis Sleek & Shine Smoothing Serum" (I had to go get the bottle for that), it is only about $5 at
Walmart. Then... 'air dry' (omg, did I actually say that) before you go to sleep... if you need a little help, use a blow dryer a little bit so you don't get your pillow/husband all wet.

But then, just leave it, don't worry about style. Don't put it in an elastic or anything. Just leave it, yes... it might look a little crazy in the morning.
THEN, in the morning... pull out a blow dryer and round brush on extra-hot and style it really good. For some reason, once you do that, it stays that way... I'm serious... but try this at home first please. I don't want to be responsible if you have any crazy hair at Disney
Please try and let me know!