Crazy Taxi cheats and cheat codes for Gamecube

No arrow indicator
Just before the driver selection screen appears, hold Start + R. 
If the code is accepted, you should see the message "No Arrows" 
in the left corner of the screen.

No destination indicator
Just before the driver selection screen appears, hold Star + L. 
If the code is accepted, you should see the message "No Destination Mark"
in the left corner of the screen.

Enable Expert mode
Just before the driver selection screen appears, hold R + L + Start. 
If the code is accepted, you should see the message "Expert"
in the left corner of the screen. There is no any kind of indicator
in this mode.

Special Taxi
Go to the driver selection screen, then press L, R, L, R, L, R or 
L + R, L + R, L + R. After, choose any of the characters to 
drive a bike.

Another Day mode
Go to the driver selection screen, press R, then hold R while selecting 
a driver. If the code is accepted, you should see the message "Another Day"
in the left corner of the screen.

Different display
Start a new game in arcade or original mode. 
Hold L1 + R1 and push Circle on controller 2 to toggle between 1st person 
views and rear views. Hold L1 + R1 and push Square on controller 2 to view 
a speedometer. Hold L1 + R1 and press Triangle on controller 2 to zoom 
out to a pass-by pan. Hold L1 + R1 and press X on controller 
two to reset the display. Submitted by MothMan