All rides, attractions, and shops:
Enter the nickname Bovine. You'll hear the crowd cheer to confirm.

Extra money:
During the game press and hold Circle+Square+X. This code can be used as many times as you want.

Expensive park:
Enter the nickname Bud. Now press Square at the Park Selection screen. You can now set maximum prices on everything.

Thanks to Revolution readers Tuffluck, at and lamar powell, chance and The Man!