I'm from SW FL and born in Miami. I never rode motorcycles down there but I was a cyclist and "incompetent cagers" doesn't quite cut it. There are a lot of ignorant people in those parts, redneck and otherwise, and I dealt with a lot of aggression. Mostly you'll need to ride smart, even smarter than you already do. One day while visiting back in Miami I was in my car making a right-hand turn from a turning lane when someone came across from two lanes to make the turn to cut me off while smacking my bumper. Insurance report? The dude sped off quicker than I could grasp what happened. I-95 in Florida is ranked as the most dangerous road in the U.S. The accident rate is insane.
I don't mean to sound alarmist, just slow down and be aware. As far as the heat goes you'll want to pick up some of the desert rider tricks like wet scarves and whatnot and stay hydrated. Don't let the heat keep you from riding in gear.
I got my V this year, and have been enjoying it every day in Raleigh, NC. If i still lived in Miami, (was there for 17 years) I would have never thought of getting a bike down there. It is going to be a cultural shock for you going from one extreme side of the country to another. Good luck, and i do also recommend never riding without gear, even though you don't need to wear a helmet in Florida.