I'm smiling at your question, Cari Kay, because that's the topic of my latest Hub I'm trying to finish. I was hoping to publish today, but ran into all kinds of issues with the website.
I've lived in Florida for the past 14 years, and struggled with the same question early on. Of course, you already know that no one does Christmas better than Disney - so we won't go there!
My very favorite place, thus far, during the Holidays is St. Augustine. Their annual "Nights of Lights" festival is definitely worth checking out. It runs for 2 months from November 22 to January 31. You'll see over 2 million white lights which can be viewed on foot, by carriage, or by boat. The Christmas "Tour of Homes" and "Tour of Bed and Breakfast Inns" is a must see! And... one extra benefit... it's in northern Florida so it's usually a little "cooler!"
I could mention more, but better go work on my Hub! :-)