There is a hidden password system in Mysims to unlock unique outfits and special furniture. To reach this password screen, do the following.

-While running around town, bring up the pause screen with the - button. Then input the following commands on the Wiimote (not nunchaku):

2 button, 1 button, Dpad down, Dpad up, Dpad down, Dpad up, Dpad left, Dpade left, Dpad right, Dpad right.

A special keyboard to enter passwords will now appear allowing you to unlock clothes and furniture. The following 3 passwords are a gift for reserving the game, and are case sensitive!

Once you reach a set level you'll receive a message telling you what new tool you've earned.

After bringing your towns interest level to 100% in any of the six categories you will recieve a message telling you that a special guest will be waiting for you in the hotel. This Uber-Sim will be waiting in the hotel the next day.