My Wife and I spend January's in Florida and usually put 500 miles on our Schwinns BUT on the Gulf side.
Suggest to them that they purchase Florida's Paved Bike Trails which covers the entire State.
We like Blueberry Hill in Bushnell, just off I-75, because they always have a site for us and the Withlacoochee State trail is just a short drive away.
We also like the Dunedin RV Resort and ride the Pinellas Trail just across the street. The downside is that it is difficult to get into in the winter.
Both of the trails are in the book.