During the game move the thumbstick as follows - Down, Up + Left Trigger (at the same time). You will receive a "cheat activated" screen when done correctly.
Unlock Site B
Defeat every mission in the game to unlock site B at the main menu.
While playing a game, press L(3), Left(3) to make all carnivores in your park stressed.
Tap the triggers L and R at the same while pressing left, right, down. If you do it correctly you should be able to get a whole lot of fossils you can buy at the fossil market!
Use analog stick and press the triggers L and R at the same time while going from left to right each one time while using the analog stick, you may have to do it a second time.
Tap L and R at the same time while pressing analog stick or whatever you wish to use two up and two down, if you entered it correctly you should have a whole bunch of bones ready to buy on the market.
While tapping the triggers L and R tap left, up, down. This is something a bit tricky so don't get frustrared the first time, keep on trying and you soon will get it.
While playing a game, press Right(3), R.
Press: Down, Down, Down, Left, Right, L, Down, Up.
While playing a game, hold L + R and repeatedly tap Up. Dinosaurs will no longer get sick. In the PAL version of the game, press Up(2), R, L, Up(2) while playing game.
Gimme Some Money
While playing game, press L + Up, L + Down. $10,000 will be added to your finances.
Where's The Money?
While playing game, press L + R, Down. Your finances will be reduced to zero. Alternately, press L, R, L, R, Down(2) while playing game.
While playing a game, hold L + R and repeatedly tap Up, Down, Up, Down. One of your safari cars will blow up. Alternately, press R, L, Up, Down, Up, Down while playing game.
While playing a game, hold R and press Right, Left, Right, Left, Right. All tourists will die. Alternately, press Left, Right, Left, Right, R while playing game.
If you want more people to visit your park, build four or five entrances on all different sides.
Avoiding visitor deaths
Never build a Safari Adventure in your T-Rex cage. The visitors inside of the car will not live too long. Also, never put more than one T-Rex in one cage. One will be killed and the other badly injured; and the visitors around the cage will get scared to death. This costs you a lot of money, for the T-Rexes and the fines.
Press - R + L, Left, Down, and Right[x2] to shoot from the Safari cars by using the camera.
Press L, R, L, Right, Down, R.
Press L, R, Down, R, and L to kill all dino's.
Press - R + Down and R + Down to cause a heat wave.
Press - R, Right[x4], and R to unlock all missions, exercises, and sites.
Press: L, Left, Left, R, R, Right.
Press - R[x3], L, and Right to make the dino's look like the living dead.
Minimum Security press: Down, Down, Left, Right, L, L, Up, Up.
Press R, Up, R, Right, L, and Down to set all excavated dinosaur DNA to 100%.
No Red Tape
Press - L, R, Left, and Down[x4].
Press: Up, R, Down, L, Left, Left.
Open To The Public
Press - Left, Down, Right, Up, L + R, and L + R to freely select three dig sites without any stars.
Press: L, Left, Up, Left, Up, Left, L.
Press: Down, Up, Down, Left, R, R, R.
During the game hit L, L, L, left, left, left.
Press - L[x3] and Left[x3] to stress out all Carnivores.
Press: Right, Right, R, R, L, Down.
Seal of Approval
Press: Right, L, Up, L, L, Down.
Press: R, R, Left, Right, Up, Right.
Press: L, R, Down, Down, L, Right.
Welcome To Melbourne
Press R[x2], L, R, Down, Up, and Down to cause stormy weather.
Welcome to Sydney
Welcome to Sydney press: R, L, R, Down, Up, Down.
To unlock Site B you have to beat all of the missions, it's cool because you make the dinosaurs and watch them run wild on your little island paradise.