Cheat Names
     Rename  one  of  your park guests to any of the following for the
corresponding effect.

Instructions:

While playing, click on a peep in your park. 
Click the General Information button (has an "i" on it). 
Click the peep's name, then delete or backspace over it. 
Enter the cheat code as the name, then press Enter. 

The cheat will take effect. 

Cheat code:             Result:
John D Rockefeller      Add $10,000
Mouse                   Guests Stare at the Ground
Atari                   All Guests Laugh and Cheer
Frontier                Rides/Coasters Never Break Down
Guido Fawkes            Advanced Fireworks Editor
Chris Sawyer            Guests Jump for Joy
Sam Denney              Peeps Ride All Coasters
Jon Roach               Peeps Ride All Non-Coaster Rides
John Wardley            Removes Height Restrictions on Coasters
James Hunt              Buggy Rides Through the Park
Shifty                  Guests Dance
D Lean                  Flying Camera Route Editor
ATITech                 Speed Up
Jonny Watts             PeepCam
Atomic                  Big Explosion
A Hitchcock             Unknown Effect
PhotoStory              Unknown Effect

     If  you  are  using  the v1 patch or higher, these codes are also
available:

Cheat code:             Result: 
Andrew Thomas           Decrease Track Friction
David Braben            Disable Lift Chain Speed Limit
Andrew Gillett          Unknown Effect
Ghost Town              Guests Cannot Enter
FPS                     Show FPS

If you are using the v2 patch or higher, these codes are also available: 

Code:                        Result:
Isambard Kingdom Brunel      Train Staff