To understand why some (beach) areas of Florida are popular with more people, there are some interesting web-sites that discuss the climate zones, of which there are four in Florida.
I'm paraprashing, but starting from Key West, and the Keys, there is a Tropical zone, then Subtropical (like Miami/Ft. Lauderdale on the right and Marco/Naples/Ft. Myers on the left), then a central zone (like Orlando), and a Northern Zone (like Jacksonville).
During what is commonly known as Snowbird season (January-April), the difference in climate is quite dramatic. Generally it ranges from you can expect to get some freezes in the north to you will never get a freeze in Key West.
The difference between Tropical and Subtropical is pretty subtle, mostly that the overnight lows are much closer to the daytime highs in the Tropical zone.
This explains the popularity of the Keys, SE and SW FL among Northerners and Europeans.
Maybe google some keywords like
Florida climate zones.
All of this is not to say that NE Coastal Florida is not interesting and appealing, because it is both of that. It is just not as popular as a winter vacation destination as further south. Neither is Orlando, except in weeks when schools are out around the world.
If it was, maybe we would be watching
CSI Jacksonville on Monday night.
