Driving to Sea World is pretty easy.
From Disney you will get onto I4 and head NorthEast and get off at the Sea World exit. It is $8.00 to park and I do not believe there is a
AAA discount on parking.
For $10.00 you can park in the preferred lot. It is right next to the main entrance. However, It is not all that far of a walk from most of any other parking areas and there is also a tram system available.