On our trip last August--I FORGOT my makeup!!! So--I was basically forced to not wear any--none sold on Disney property (that I could find anyway). It was so totally hot and humid that my shoulders and shins were sweating! I've never felt heat like that.
So, this time-in August 2012-I will only wear sunscreen on my face, mascara on my lashes and my long lasting lipstick. If I put this lipstick on at night, I wake up with it still there in the morning! It doesn't come off for anything-even 105 degree temps.
So--IMO--Just go with the mascara and lipstick route---nobody is looking at your complextion. The pics look better for you with your eyes and lips done at least.