Games for a 13th (girl) birthday party??

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My friends daughter is going to be 13 - we have a good month to plan this 13th birthday party. The party is at there house and we would prefer to use the very large yard rather then the house. The theme is "happy bunny" (see the image at the bottom.) We are wondering what kind of games do you play at a 13th birthday party? Also what kind of prizes for the games? Any ideas will be greatly appreciated! Thank you in advance!!