Extra money:
Note: This trick requires Dead Or Alive 3. Play Dead Or Alive 3 and select a character that also appears in Dead Or Alive Xtreme Beach Volleyball in survival mode. The more wins you have in survival mode, the more money you will start with in this game
Extra items:
Give a lot of gifts to one character and complete that game. Start a new game on that saved game file and choose to play as the character that received the gifts in the previous game. Those items will be available in your inventory in the new game.
Ending bonus:
Successfully complete the game. When you start a new game, you can immediately advance to the end. Select the "Leave Tomorrow" option at the hotel or pool menu to skip to the ending.
Ending sequence:
Wait for the credits to end to see a extra FMV sequence featuring Zack and the remains of his island.
Bonus music tracks:
You can unlock two hidden music tracks in the game: "How Crazy Are You" (by Meja) and "Is This Love" (by Bob Marley). To obtain them, play through the game once. When you resume that saved game file, these two hidden songs will be available in the Radio Station.
Swimsuits in exhibition mode:
Earn or buy swimsuits in story mode (Zack's Island). The swimsuits that you acquire in that mode will also be available in exhibition mode.
Disable commentary:
Enter to the options menu, then change Zack's language to Japanese.