Rides Never Break Down
Name a guy walking in your park "Frontier." - Rides never break down.
Increase Happiness of Guests
Name someone in your park "Melanie Warn" - Increase the happiness of all guests.
Name a guy who's walking in your park Jonny Watts and you'll see through his eyes :D
Unlimited Chain Lift and Launch Speed
Name a peep David Braben to get unlimited Chain Lift and Launch Speed
Name a guest: john d rockefeller.
Make a waterfall and put Jonny Watts down it. Watch him go down head first in first-person view!
Roller Coaster Cheat
Sam Denney - all roller coasters will become irrisistible for guests, all guests take each roller coaster before they leave.
Make me Sick - all guests will become sick.
Atari - everyone laughs
Jon Roach - all rides become irrisistible for guests.
M. Brookes - make it possible walls your build path.
Car to Tour Park
James Hunt - car with which you can drive around the park. (also try Buggy Rides)
Mouse - guests stand still and look at the ground.
Andrew Gillett - increase the value of your park.
A Hitchcock - many ducks will appear.
No New Guests
Ghost Town - new guests can not enter the park.
Chris Sawyer - guests jump and cheer.
Shifty - guests dance.
No Altitude Limit
John Wardley - removes altitude limit.
Fireworks/Laser Show Editor
Guido Fawkes - Unlock fire work/laser show editor.
Guests Take Photo
PhotoStory - guests take photograph.