Enter "DEMO" as a nickname at the startup screen. Then a Megapark for all the rides with some defaults such as rides not open and bad roller coasters will be available. Note: You must auction your theme park in two years and select different country for this to work.
Enter "DISNEYLAND" as a nickname at the startup screen.
Enter "HORZA" as a nickname at the startup screen. Begin a new game and enter "HORZA" to the name list to enable cheat mode. Then while playing the game, enter one of the following codes to activate the corresponding cheat function:
|$50,000||[Shift] + C|
|All rides||[Alt] + Z|
|All shops||[Ctrl] + Z|
|Trees, bathrooms, and other facilities||[Shift] + Z|