Press C during game play to get $500,000.

Hold Alt and press Z: All rides
Hold Ctrl and press Z: All shops
Hold Shift and press Z: All facilities

Killer Park:
As a nickname type demo then select continue game. That gives you a super park.

Thanks to Revolution readers Robby Roks, Ferdi Dorr, Alex Popham, Ashley Moorehouse, Max Carroll, John Allnatt, Ashley Goodwin and Barbara Kouzoukas!