Cheat codes:
While playing in 3D mode, activate the following cheats by typing in the corresponding code.

Code Result:
spawnall Create a Herd of Animals
vulture Flight Mode
hugeguns Infinite Ammo
hgwells Make Party Invisible
flagall Mark All Unlicensed Animals
gps Mark Current Position
xray View Kill Zones
license1 Hunting License (Eland)
license2 Hunting License (Zebra)
license3 Hunting License (Elephant)
license4 Hunting License (Kudu)

Free Money:
For some free money, move the cursor to the upper left-hand corner and press Ctrl-4.  Make sure the mouse is all the way in the corner for best results.