Hidden Mermaid:
     To  unlock the hidden mermaid, place the mermaid statue in one of
your marine tanks.

Hidden Unicorn:
     This  code  from  Zoo Tycoon still works with the expansion pack.
Just  rename one of your exhibits Xanadu and you will unlock a unicorn
in the animal panel. You must rename the exhibit. If you try to name a
new exhibit Xanadu, your game will probably crash.

Make Children Guests Upset:
     Name  a  male guest Boogyman and the guest causes children to run
away screaming .

Make Female Guests Upset:
     Name a male guest rpro and female guests will run from him.

Unlock Triceratops:
     Rename  one of your exhibits Cretaceous Corral. Doing this though
might crash your game.

Unlock the Deinosuchuse:
     Rename  an  exhibit  ''Super Croc'' to unlock the Deinosuchuse or
beat the Breeding the T-Rex'' senario.

Unlock the Photo Booth:
     After winning the Shark World scenario, you'll unlock the photo booth.

Unlock Ultimate Zookeeper:
     Select  a  male  zookeeper  and rename him Jonathan Gilmour. This
will  automatically  donate $20,000 to your zoo and increase zookeeper
skills.

Unlock Yellow Brick Road:
     To  unlock  the  Yellow Brick Road, place a Bengal Tiger, a Black
Bear, and a Lion into the same exhibit.

$10,000:
     During game play hit shift+4 ($) for $10,000.
     Warning:  Using  this  cheat will cause your marine tank water to
become dirty!

Add Money
     Press [Shift] + 4 to get more money.
Note: Using this cheat will cause your marine tank water to become 
dirty! 

Hidden Mermaid
     To  unlock the hidden mermaid, place the mermaid statue in one of
your marine tanks.

Hidden Unicorn
     This  code  from  Zoo Tycoon still works with the expansion pack.
Just  rename one of your exhibits Xanadu and you will unlock a unicorn
in the animal panel. You must rename the exhibit. If you try to name a
new exhibit Xanadu, your game will probably crash.

Unlock the Photo Booth
     After  winning  the Shark World scenario, you'll unlock the photo
booth. Check your structures menu and it will be there.

Scare the Children
     To  make  children  guest upset, name a male guest "boogyman" and
they will run screaming.