Alternate player colors
While playing a game, enter the options menu and choose "Function". Select "Music" and turn that option off. Wait until the ball is in "T-Up" mode, then hold Triangle and press R1 or R2.

Robot Golfer
Select the Customize Player mode and enter the name "R.Masel" (there is no space between the first initial and the last name). Then pick Bob Taylor for your golfer. Start a game, and during the "Now Loading" screen, press Left, Up, Right, Down, R1. When the game begins you'll have a shiny, metallic golfer.

Move the Cup
While playing, go into the Options and highlight Function. Select Time and change the clock to 15:14:38. Then press Triangle + Circle. You can now move the cup anywhere on the green.

Move the Ball
While playing, go into the Options and highlight Function. Select Time and change the clock to 06:19:56. Then press Triangle + X. Now you can move the ball anywhere on the course.

Change Wind Direction
While playing, go into the Options and highlight Function. Select Time and change the clock to 12:34:56. Then press Square + Triangle. Now you can change the wind direction.