You can enter these in at the cheats menu under options:

Launch Pad 69 level: SHOWMETHEMONKEY
Rampage Skatepark level: IOWARULES
The Dam level: THATDAMLEVEL
Las Vegas level: SHOWMETHEMONEY
Roots level: UNDERGROUND
Sheep Hills level: BAABAA
Syracuse level: BOYBANDSSUCK

Night vision mode: 3RD SOG
Happy bunny mode: FLUFFYBUNNY
Ghost control mode: GHOSTCONTROL
Super crash mode: HEAVYPETTING
Green skin mode: MAKEMEANGRY
Visible gap mode: PARABOLIC