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.