Aimee asked: I am aware that in Orange County, Florida riding the sidewalks is acceptable, but are the bike riders required to ride with the flow of traffic? And is it required to use the bike lanes, if they are there, instead of the sidewalk?
Bicyclists may always use sidewalks unless prohibited by a local ordinance, even if there is a bike lane in the roadway. When in the roadway, the cyclist must use the bike lane under some circumstances.
A cyclist on the sidewalk has all the rights and duties of a pedestrian and there is no directional requirement as there is in a bike lane, which is a part of the roadway.
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.
There is much more about sidewalks and bike lanes in the posts under those subjects in the tag cloud.