Thrillville
While in any park, press X, B, Y, X, B, Y, X to unlock all parks.
While in any park, press X, B, Y, X, B, Y(2) to unlock all rides.
While in any park, press X, B, Y, X, B, Y, A.
While in any park, press X, B, Y, X, B, Y, B. Then at the mission selection screen, press X to complete the highlighted mission and unlock the next mission. Note: Each time Square is pressed on a highlighted mission, the rank of the completion increases (from bronze, to silver, and finally gold). To reverse your progression on a mission, press B at the mission selection screen to remove the highlighted mission medal.
Get a 100% game completion to unlock the final two mini-games.
Tap A on the Chat menu instead of choosing which is the best conversation for someone.
In Career mode, get good rides and leave the game running while you are sleeping. You should have lots of money afterwards.
Play the Flirt mini-game instead of the regular conversation. Note: This option only becomes available after you reach the Love Interest level.
Keep pressing the third icon to either become their friend or sweetheart faster.
Change the Hat Stall theme. To do this, press X, then choose "Inventory". Select the Hat Stall, select "Customize Style", then choose the themes. Change it with Left or Right.
When you play the Flirt mini-game and the topic is "Galaxy Far, Far Away", your character will say something similar to "In my opinion, Anakin Skywalker is the best Star Wars character ever".