Get dropped off at the airport, then walk across to the parking garage. I've never shot up there on top of the parking garage, so I can't really give you anymore info. According to MCO
Where are the best places for aircraft spotting?
On completion of a "Use of Facilities Form", aircraft spotting/photography is permitted on Level 9 of the Terminal Top Parking Garage, which provides a panoramic view of most of the airfield and airside terminal buildings. The form must be completed in person, and accompanied by a valid photo I.D., between the hours of 8:00 am and 5:00 pm, Monday to Friday (excluding public holidays), at the Public Affairs office, located on the 3rd level of the Main Terminal in the Aviation Authority Executive Offices (to the left of the East Security Checkpoint for Gates 60-129).