I'm not a local, and I have only used the Lynx system to get to SeaWorld from WDW...so, I'm no expert. BUT, having said that, I have heard many locals advise against using the Lynx system to get around Orlando. There are some not so nice areas (as in the majority of cities) and if you mistakenly get on the wrong bus, or don't make the correct connection, you could find yourself in an area you didn't want to be in.
I think you are much better served by taking cabs. More expensive? Yes, but ever so much safer and more efficient.