Roller Coaster Tycoon 2

Roller Coaster Tycoon 2 cheat codes: 
Name a guest to one of the names listed below for the desired effect:

Chris Sawyer       - Photographer guest
Simon Foster       - Artist guest
Katie Brayshaw     - Waving guests
Tony Day           - Hungry guest
John Wardley       - "Wow!" thinking
John Mace          - Guest pays double entrance fee
Damon Hill         - Faster Go-Karts
Michael Schumacher - Even faster Go-Karts
Mr Bean            - Slower Go-Karts

Increase guest happiness:
Enter Melanie Warn as a guest name. You can rename the guest to another name
and repeat this on another guest as needed.
Keep doing this to also increase your park's rating.

Multiple names:
You can have more than one person with the same name (which works well when
using the cheats) by changing the capitalization of various letters.
For example Chris Sawyer can be used on another person by making all letters
lower or upper case (chris sawyer and CHRIS SAWYER).

Guests never leave:
Put a "No Entry" sign by the entrance, facing away from the entrance. Guests
can still come in, but will not leave. Note: This may cause your park rating
to decrease, because many guests will be "lost" and want to go home.

Extra building space:
Build a ride or attraction such as a maze. You can now build on top of
that with smaller rides (for example, bumper cars).