Call your guests the following names to unlock the corresponding effect.

Melanie Warn:
Increase park happiness

John Bibrough Guest:
Increases park rating

Mr.Bean:
Slow Go-Kart driver

Michael Schumacher:
Fast go-kart driver

Damon Hill:
Fast Go-Kart driver

Simon Foster:
Guest paints pictures

John Mace:
Guest pays double on rides

Chris Sawyer:
Guest takes photographs

Richard Branson:
Guest will make other guests rich

Richard Tan:
Guest will steal from other guests

Big Bucks
Guest never runs out of money

Tony Day:
Makes guest hungry.

John Wardley:
Guest always thinks, 'WOW!'

Katie Brayshaw:
Waving Guest


Unlock Mega Park:
Successfully complete ALL scenarios.

Naming your Guest:
To activate a cheat change a guests name to the following:

Katie Brayshaw
Guest waves to everyone

John Mace
Double payment for rides

Melanie
Guest increases park happiness

Chris Sawyer
Guest takes photos

John Mace
Guest pays double entrance fee

Damon Hill
Guest floors go-karts

Mr Bean
Guest drives slowly in go-karts

John Wardley
Guest always thinks, 'WOW!'

Simon Foster
Guest paints portraits

BigBucks
Guest never runs out of money