All Golfers and Courses 
To unlock all of golfers and courses do the following

Turn off the PlayStation and Remove the Memory cards, Turn on the Playstation with the buttons held on the 2nd controller (L1 + L2 + R1 + R2) before the HotShots Golf Logo. As the Logo comes to the Foreground, press Up (2), Down, Up, Left, Right (2), Left, Up (2), Down, Up, Left, Right (2), Left ­ while still holding the shoulder buttons. A tee shot sound will confirm the code
Submitted by Adam Saltz

Mirror Courses 
Highlight a course at the course selection screen, then hold L1 + L2 and press X. 
Submitted by Adam Saltz

Mirror Golfer 

Hold L1 while selecting golfer.....turn slices into hooks for more yardage.