Unlockables

Tools to use around town - Once you reach a set level you'll receive a message telling you what new tool you've earned.

Blow Torch Have your town reach four stars
Crowbar Have your town reach one star
Pickaxe Have your town reach three stars
Saw Have your town reach two stars
Town Monument Blueprint Have a 5 star town

Unlockable Uber-Sims - 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.

Unlockables

Amazing Daryl 100% Fun Town
Chancellor Ikara 100% Tasty Town
Hopper 100% Cute Town
Mel 100% Spooky Town
Samurai Bob 100% Studious Town
Star 100% Geeky Town

Unlock Special Outfits and Items - 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!

Password Effect

F3nevr0 Bunk Bed (Furniture)
N10ng5g Camouflage pants
Tglg0ca Diamond Vest (Outfit)
Gvsb3k1 Genie Outfit
Ghtymba Hourglass Couch
I3hkdvs Kimono Dress (Outfit)
T7srhca Modern couch
Ahvmrva Racecar Bed (Furniture)
Itha7da Rickshaw Bed
R705aan White jacket