Leo asked: Is it legal to ride on the sidewalk around Lake Jackson?
Unless there is a local ordinance to the contrary, riding a bicycle on the sidewalk in Florida is permitted.
s. 316.2065 – Bicycle Regulations
(9) A person propelling a vehicle by human power upon and along a sidewalk, or across a roadway upon and along a crosswalk, has all the rights and duties applicable to a pedestrian under the same circumstances.
(10) A person propelling a bicycle upon and along a sidewalk, or across a roadway upon and along a crosswalk, shall yield the right-of-way to any pedestrian and shall give an audible signal before overtaking and passing such pedestrian.
You will need to be more specific since there are a number of areas named Lake Jackson in Florida; Tallahassee, Sebring and north of Tampa, to name a few.
You will also need to specify if your Lake Jackson is a park and if so, its designation. For example, if your Lake Jackson is in a park in Leon County, there are three categories of park, each of which has different rules.
If in Sebring, the trail around Lake Jackson seems to be just a sidewalk and the only restriction in Sebring or Highlands County is this:
Sebring – Code of Ordinances
Sec. 22-5. – Riding bicycles and skateboards, rollerskating in certain areas.
It shall be unlawful for anyone to ride a bicycle, rollerskate or ride a skateboard on the sidewalk on Circle Drive, the sidewalks on North Ridgewood Drive between Circle Drive and Pine Street, and on such other public sidewalks and public areas where authorized signs are erected indicating that such use is prohibited.