When entering details for a new park, enter these details (make up the rest):
NAME ------- "MARK LAMPORT"
NICKNAME --- "MARKL"
LEVEL ------ "SANDBOX"
OPPONENTS -- "ALL"
OPP. LEVEL - "EASY"
And leave the park name blank. Then, in game (for every park you set up):
While holding down 'LSHIFT' type "Z", "X" then release shift. Then hold down 'LALT' and 'LAMIGA' while typing "Z", "X". You will then have all of everything, except money. To get money, turn 'CAPS LOCK' on, and hold down "C". The money will start going up, but don't go over 999 million or you'll go back down to minus two billion!