Since you are only looking for a trial flight, turn up at just about any airport, large or small, ask for the GA (general aviation) area and somebody will fix up a flight for you. Flying in the USA is far less formal than here. Are you flying into Miami, Sanford or Orlando? there is a huge geographical distance between Miami and the other two. Do you know exactly what your itinery is? If you can be more specific, it may be possible to actually suggest a particular airport and school. There are no JAA schools in the immediate Miami area so you may just wish to settle for a trial flight at this stage.