This is what I did:
Day one, play as Lisa and team with Tina. Buy as many love and like items for the girl you want the suit for and give her at least two a day (preferably a like and love item) until she starts opening the gifts in front of you. On the 11th day, give her a like item first and then a love item, making sure she is opening them. End the day. On day 12 give her a love item, the suit she wants and then another love item. If you can't give her love item before you go back to the hotel, such as she only was around in the Afternoon and you had to give the suit to her in the evening, give her a love item from the hotel room and then leave the island. You don't want the next day to come around.
Now, play as the girl you gave the suit to and team with Lisa. Buy love items if you can, otherwise give send her a like item from the hotel room (again, send a love item if you could find one) and do this all the way till the end of the game. On day 13, she gave me the Venus suit as a gift.
I spent so many hours trying to do this, its sickening, and I'm glad I finally got it this time. I don't know if you have to give the person you want the suit on love items all the time. I imagine you just need to make the notes on her head go fast (there is a slow and a fast for the notes). Make sure the notes are going fast when you give her the Venus suit (mine were going slow and it still worked, but better to be safe than sorry) and also make sure before you give her the suit that she has been opening the gifts when you gave them to her. She will hate the suit no matter what, so when you give it to her, you need to soften her up with another love item and then leave before she has a chance to throw it away. Hopefully by day 13 next game, Lisa will have given you the suit.
Also, I forgot to add. I didn't play Volleyball against any team that had the character I was trying to give items to. When the girl I was trying to give items to every day wasn't around, I just played against a team and won some money.
When you end the game and successfully gave the suit to the girl you wanted to give it to without her throwing it away, make sure you play A LOT of Volleyball games and win them, making sure Lisa is as happy as she can be (the notes should always be moving fast, but slow moving notes are ok as well). This helps in two ways: It keeps her happy and more likely to give you items, plus raises money to buy items for her. For the entire game, Lisa should be happy with your playing ability, as well as been receiving a love/like item every day.
Venus Method #2:
Try giving it on the 12th. you cant give anything to anyone of the the other girls until this day and give your favorite a lot off "love itens". she will throw away venus on the 12th, but you have to play to the end off the vacation . star another vacation with your favorite girl and give lots off love gifts to lisa she will give you the venus. 70% chance
Sports Shop contains swimsuits and bikinis. After purchasing these suits/beach wear you will unlock them in exhibition mode.
Accessory Shop has sunglasses, hats, shoes, as well as other pertient items. Remember some items decompose rather quickly (flowers) and must be bought to give as a gift that night or later that day. When giving a girl an accessory remember they might not take that item off until the vacation ends or until you start a new vacation.
The Hopping Game:
You can make some extra money by playing this game, which has you jumping across floating pillows. The best way to play this game is by skipping along the pillows. Once one foot touches a pillow you should move forward to the next.
Winning Casino Games:
The best games to play in the casino are blackjack and poker. These games work on standard rules and tips for the games can be found on your favorite search engines.
Extra money:
By playing 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 Dead Or Alive Xtreme Beach Volleyball.
In a volleyball match, the less points the opposing team scores, the more money you will end up getting.
By winning a volleyball game 7 to 0 will earn you 150,000 credits. To ensure you never miss, only use the underhand serve as it is guaranteed to go in. This is a great way to earn money quickly, but requires a lot of effort and a good partner.
Have Leifang - Wear almost nothing:
Wait until after the fourth day for the Oreial swimsuit. It barely covers her skin, but will cost a lot of money (600,000).
Ending bonus:
Finish the game. When you begin 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.
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.
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.
Moving your partner:
If you do not like the position in which your partner is standing during a match, you can move them by using the Right Analog-stick.
Lock view:
When viewing a "Gravure" movie or another camera-controlled angle, click the Right Analog-stick to lock and unlock the desired angle.
Give any girl a swimsuit:
Buy the gift, then wait until you get to your hotel. Give them the gift, then immediately choose LEAVE TOMORROW. Then, continue your previous game as the person you gave the swimsuit to. It will automatically be in your inventory.
Food:
If your character is not performing very well, take them to get some juice or food to eat. Afterwards, do the pool hopping game to increase their response and enthusiasm.
How to Unlock it:
To unlock this, you must bet 3000 Zack dollars on Christie's slot machine at the Casino, and you need to hit the JACKPOT (3x Christie) for 9 times. Dont worry, you dont need to do this in one night, you can simply try it again the next night and so on.
Anyways, Once you hit 9 Jackpots, the entire pole dance sequence will be shown. Now go back to the hotel, go to sleep, and continue on the next day until night time. Zack will give you a present. Open it with the Secret Ticket inside (picture below :D)

Tips:
Use the Casino Trick to get yourself at least 20 Million before you start betting on Christie's slot machine. Once you've got 20 Million on your dispospal, getting the jackpot is only a matter of time ;)
Using the Secret Ticket:
You can only use the Secret Ticket at the Hotel Room. otherwise you'll only have an option to look at it.
KEEPING THE SECRET TICKET -> IMPORTANT !!!!
(READ THIS OR YOU WILL REGRET IT)
The Secret Ticket will "Vanish" after one use, and you need to hit 9 jackpots again to retain it. You sure dont want that to happen, do you ? Dont worry, there is a way to prevent this. During the pole dancing scene, near the end (after she spread the legs, around 1.30 minute) turn off the game by pressing the POWER BUTTON on your Xbox 360 (not signing out like in the casino trick). After that reload your game and your Secret Ticket will remain intact ;) Now you can see the Pole Dancing scene over and over and over again....using different suits and such :) ENJOY !!!
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