All tracks: 
Select the Cheats-option at the main menu. 
Enter CHIMPGIVEAWAY as a code, then enable
that cheat at the Code-collection screen.

All cars: 
Select the Cheats-option at the main menu. 
Enter MONKEYSPOILERS as a code, then enable
that cheat at the Code-collection screen.

All Tracks:
Go to the cheat option on the main menu and
put in CHIMPGIVEAWAY.

Get Kid Mode:
Go to the cheat option on the main menu and
put in THOSEWACKYKIDS.