Play Quick Game or Full Game to unlock theme park stuff.

CLUE Decorations - Play a game twice, four times, and six times
Golden Statue - Play a game five times
Mascot - Play a game once
Mouse Trap Decorations - Play a game twice, four times, and six times
Mr. Potato Head Costume - Play a game three times
The Game of LIFE Decorations - Play a game twice, four times, and six times
Ticker Tape - Play a game six times
Twister Decorations - Play a game twice, four times, and six times
Yahtzee! Hands Down Decorations - Play a game twice, four times, and six times