The Sims 2: Castaway Cheats

Cheat Gnome
While on a lot, quickly press B, Z, Up, Down, B 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:

Quickly press 2, Up, Right, Z, Right: Add One to Skill.
Quickly press A, A, Down, Down, A: All Crafting Resources.
Quickly press Minus, Plus, Z, Z, A: All Motives.
Quickly press Plus, Plus, Minus, Minus, Z: All Plans. Quickly press Left, Right, Left, Right, A: Maximum Current Food and Resources.
Quickly press Z, Plus, A, B, 2: Maximum Relationships.

Name Cheats
Instead of using the dumb old cheat gnome which is hard you can also name them stuff for effects! Here are some of them:

First name: Princess Last Name: Zelda - Find the treasure without the map
First name:Mr. Last Name:Pilot - Instead of a shipwreck you crash down on a plane, you start out with all your crew