Sunscreen and insect repellent :-)
Daytime temperatures will be down in the 70/80s, but the UV exposure is still high, so, as they say in Australia, "Slip on a shirt, Slap on a hat, and Slop on the sunblock".
What part of FL will you be visiting?
The last time I checked, the rules on dogs in Florida state parks are variable, but can go up to four. You might find this useful:
http://www.abfla.com/parks/info/petparks.html