500 thrill points:
Press B, X, Y, B, X, Y, X during game play while in a park.
Missions unlocked:
Press X, B, Y, X, B, Y, B during game play while in a park.
All Party Play mini-games:
Press X, B, Y, X, B, Y, Right during game play while in a park.
All parks:
Press X, B, Y, X, B, Y, X during game play while in a park.
All rides in current park:
Press X, B, Y, X, B, Y, Y during game play while in a park.