Walt Disney World
That depends on what you like to do. If you like theme parks, Orlando. If you like Cuban coffee and fashion, Miami. More laid back vibe, the Keys. (Key West if you like to drink.) Golf or other outdoor activities, like kayaking and hiking, anywhere else.
I haven't been to Florida, but when I'm going to visit a new place, I check activites and tour sites https://travelsites.com/activities-tours/. They can provide you with all necessary information about places of interest and sight-seeings. Also it is possible to book tour beforehand. I hope, you will find this source to be helpful!