Maybe a slighter smaller coaster where the giga was or similar behind the park but not hugging the smae areas.^What other integration is there? This park sply does not have much else to work with in terms of space, city approval and neighboring approval.
Or as others have proposed you could enter past the ghostrider area where the furthest food stands are for festivals and basically go behind Ghost and go toward/use up some of the market place parking, you could turn left and up toward the entrance and back. Or turn right and hug beach toward crescent and turn around and go back. Im sure this isnt the only acceptable option. With money and will, there is a way.
Crude but you have this area to play with
Personally in my dreams with unlimited money Id take that main Blue area the parking lot and build a real nice Knotts resort hotel, tear down the old one and now you have more backstage room and could expand the park