I presume you mean to bike around OKW. I don't think I'd venture out of OKW on a bike. WDW looks like a pretty dangerous place to bike to me -- and I bike in Miami! No bike paths and way too many people who don't know where they are going and not paying attention to little details like bicyclists and pedestrians.
Can't help you with the path between OKW and DTD.
Diane's caution about pedestrians is a good one. Biking on sidewalks is not illegal in Florida, but the burden is on the bicyclist to avoid pedestrians. You'll probably be safer in the street, anyway.
Helmets are required by law for all bicyclists under the age of 16. After 16, it's one of those pesky "natural selection" decisions.