People who aint from around here always seem to wonder how we survive in the heat as though it requires super human strength or supernatural intervention
Well, its really quite simple. WE AVOID IT WHENEVER POSSIBLE!!!!
Rule # 1) If you dont have to be out in it, dont
Rule # 2) If you are out in it, and you have the option of standing in the direct sunlight or in shade, choose the shade
Rule # 3) If there is no shade, wear a hat, preferably one with a wide brim (like a bucket hat or cowboy-type hat) so your head doesnt get burned as easily
Rule # 4) If you have to be out, drink lots of water or water-based substances alcohol only makes dehydration worse, as does caffeine in large quantities, so put down the beer and the coke and drink water or gatoraide or something similar
water is always best
Rule # 5) If you have the opportunity to be in an air-conditioned environment, do it
Rule # 6) Sunscreen is your friend
you will burn in less than 20 minutes most days during the high summer in Florida, especially if you arent used to the heat, but even natives can burn quickly and even if you arent burning, youre still absorbing carcinogins
Those little hand held fans or fan-misters are great my DW and I found some at Wal-Mart that were less than $2 each and they fan blades are foam so they wont cut you (though they can get tangled in long hair) so they are safe for kids. Just carry one of those for each person in the party (with belt clips they are easy to keep with you) and if you are stuck somewhere warm, just use it to cool off a bit until you can get to more shade and/or air-conditioning.
But the heat isn't normally the problem for out-of-towners, it's the humidity, which can take a day that is 92 degrees and make it feel like it is 115 degrees and makes the air heavy and sticky. You will sweat a lot, so plan for extra clothes and wear things that breathe
And if you wear sandals don't forget the sunscreen on your feet - they will burn very quickly if you don't often walk around in sandals in Florida or other warm climates... then you'll be flat on your back complaining about your burned feet...

(That was just an effort to throw in another smiley from the choices, haha)