Bonus outfits
Pause the game, then press Square, R2(2), Triangle, Down at the "Fashions And Grooming" screen to unlock a vest for a male and a tank top for a female.

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Cheat Gnome
While on a lot, quickly press R1, L1, Down, Square, R2 to spawn the Cheat Gnome. The Cheat Gnome appears at different locations, depending on which island you are on. Find the Cheat Gnome, then enter one of the following codes to unlock the corresponding option on the Cheat Gnome:

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All motives
Quickly press R2, Up, X, Square, L1.

All plans
Quickly press X, Triangle, L2, Square, R1.

All crafting resources
Quickly press Square, Triangle, Down, X, Left.

Maximum current food and resources
Quickly press Left, Right, Square, R2, Square.

Maximum relationships
Quickly press L1, Up, R2, Left, Triangle.

Add one to skill
Quickly press Triangle, L1(2), Left, Triangle.

Sim standing on water
When your Sim is swimming, press Circle and select an item.