Get Infinite Cash:
To get unlimited cash simply press UP, [, UP, [.

Hack: Change Starting Money:
NOTE: The following will require you to edit game files, so make back-ups before proceeding.

This hack allows you twiddle other values to enhacne your game. Locate constant.ini in your drive letter:\jpog\data\ directory. Open the file using a text editor (like Notepad) and adjust any of the following lines to alter your game (note that the default values are listed). All of the values are self-explanatory (start drooling).

GAMEMONTHS_TO_ACTUALSECONDS = 300;
GAMEWEEKS_TO_ACTUALSECONDS = 75;
GAMEDAYS_TO_ACTUALSECONDS = 10;
MaxDinoPopulation = 60;
ParkStartPlayerMoney = 60000;
ParkMaxEntryFee = 5000;
ParkMaxPopulationCap = 100;

Hack: More Site Teams:
NOTE: The following will require you to edit game files, so make back-ups before proceeding.

This hack allows you to deal with the increased number of dig sites from the Dig Site Hack. Locate constant.ini in your drive letter:\jpog\data\ directory. Open the file using a text editor (like Notepad) and search for the lines FossileHuntStartNumteams and FossileHuntMaxNumTeams. Change both values to 99. Search for the line FossileStorageMaxItems and change it to something around 15.

Hack: More Units/Structures:
NOTE: The following will require you to edit game files, so make back-ups before proceeding.

This hack allows you to twiddle the max number of units and structures you can create. Go into your drive letter:\jpog\data\unit directory. Open the following files using a text editor (like Notepad) and search for the line UnitSpecific for each one. Change the value to something you like, then save the file with a .ini extension.
HerbFDsp.ini (herbivore feeders)
CarnFDsp.ini (carnivore feeders)
Toilet.ini (bathrooms)
Hatchery.ini (hatcheries)
HuntPlat.ini (hunting platforms)
Kiosk.ini (kiosks)
shop.ini (shops)
hvdome.ini (viewing domes)
hventry.ini (viewing vents)
safari.ini (safari rides)
Road.ini (roads/paths)
rangerdp.ini (ranger stations)
ViewPlat.ini (viewing platforms)
turret.ini (security turret)

Hack: Unlock More Dig Sites:
NOTE: The following will require you to edit game files, so make back-ups before proceeding.

This hack only allows you to unlock all dig sites on islands you haven't explored. If you've landed on any island and started digging, that island is excluded from this hack. Locate FslHunt.ini in your drive letter:\jpog\data\ directory. Open the file using a text editor (like Notepad) and search for the line maxchosen. Set that value to 9. Save the file with an .ini extension.