Go to the options cheat screen and enter one of the following codes:

LOTSAMONEY - Receive cash
CHEATINGMUTHATRUCKER - Unlock it all
DAISHI - Tiny people
6WL - Damage toggle
VARLEY - Get nasty truck
GINGERBEER - Quick truck
VICTORS - Get diplomatic immunity
PUBLICTRANSPORT - Get unlimited time
LAZYPLAYER - Level select