To unlock alternate clothing press Triangle + Square + X while the Hot Shots logo is bouncing on the title screen. The girl at the main menu will be wearing different color clothing.
Remove all memory cards from the PlayStation. Hold L1 + L2 + R1 + R2 on controller two when the screen flashes just before the Hot Shots logo appears during the opening sequence. Keep those buttons held, and press Up(2), Down, Up, Left, Right(2), Left, Up(2), Down, Up, Left, Right(2), Left on controller two while the Hot Shots logo is in motion. The sound of a wood driver will confirm correct code entry. All golfers, courses, and challenge mode will be unlocked.
To perform an in game reset hold L1 + R1 + L2 + R2 + Start + Select during game play.
To reverse courses highlight a course at the course selection screen, then hold L1 + L2 and press X.