WOW, I thought New Orleans was HOT in the summer. Orlando's heat felt worse than ours, and after living in N.O. for so many years, I am used to high heat and humidity.
I bought a hat on my first day there to help shade my face. It rained a little every afternoon, and that helped some, as long as the sun was behind the clouds.
I tend to sunburn, so I put on Sunscreen....Remember that you can sunburn even on cloudy days, so protect your skin.
Drink lots of water, and take a rest when you are tired.