I have actually been thinking this one over and here would be my approach to the problem.
To expand the action zone, take out about half the que to Top Gun, build a midway underneath the ride, and bingo! The action zone has more room.
As for the rest of the park, it may be trickey. For expanding towards the back, build underneath the structure of the Racer. That would open up the back of the park.
The Rivertown area could be opened up fairly easily, just build along the exit path from WhiteWater Rapids. that ride is put deep into the woods. that way Rivertown could be expanded.
With these 3 areas opened up, PKI could get to the rest of their property.
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the Beasts` Den