Ditch Rodman 
     To  get  rid of Rodman's voice, go to the Options menu and change
Zack's voice to Japanese.
 
Skip to Ending 
     Once  you've  finished the game once, you will be able to skip to
the  end  of  the two weeks with any girl. Go to the Hotel or Poolside
menu and select "Leave Tomorrow" to end the game after that night.
 
Start With More Items 
     To begin with a ton of items, give a bunch of gifts to a specific
lady.  Then finish the current game and start a new one (with your old
save) and play as the woman you gave gifts to. Whatever she keeps will
be in her Item inventory when you begin a game with her.
 
Unlock Swimsuits For Exhibition 
     To  have more swimsuit choices in Exhibition Mode, buy or acquire
suits  in  the Zack's Island game. Whatever you gain in that game will
be available for the Exhibition beach.