I lived in Florida for 7 years while on active duty. The best beaches are in the panhandle (my opinion) around Panama City because the water is cleaner and clearer. And unlike California, you dont have to wear a jacket and long sleeves to go to the beach.
My favorite part was probably Orlando because of DisneyWorld and Universal Studios. I love theme parks/roller coasters. St Augustine is a really cool place to visit too because it is one of the oldest cities in North America. Florida also is home to 3 NFL teams (Jacksonville, Tampa Bay, Miami), 2 NBA teams (Miami, Orlando) and 1 pro baseball team (Florida Marlins). And many pro baseball teams have spring training there which is affectionately called the "Grapefruit League."
Other points of interest:
- Cape Canaveral, where NASA launches the soon to be retired space shuttles and other space vessels from.
- Miami Beach.......not much more to say there.
- Daytona Beach, where the biggest NASCAR race is held
- Sea World in Orlando