If your destined for Florida we have the Pinellas Trail which is a moderate paved trail for bicycles, roller skaters and pedestrians.
Pinellas County, Florida - Park & Conservation Resources - Pinellas County Trail Guide
Pinellas Trail | Home
If you timid about getting on a bicycle and getting too fatigued to pedal back check out the free rentals at the local Pedego Electric Bicycle shop in Dunedin Florida or any other Pedego shop in the country.
For those into Mountain Biking we have what many consider an International Mecca for Mountain Bikers, the Santos Trailhead and Campground in Ocala Florida which is part of the State Parks system here having over 80 miles of bicycle trails from beginners to ultra advanced. The ultra advanced have obstacles that most would have trouble dealing with crawling over never mind riding over on a bicycle.
If a motorcycle or scooter is more to you liking you can refer to the Motorcycle Roads website and search any state/location for recommended routes to take a leisurely ride on too.
Lots of great walking, bicycling and motorcycle routes all over the US that's for certain. Its wonderful that areas like Tucson, Pinellas, Ocala along with other State, County and Local parks administrations all over the US are making such nice provisions available to us.