Bikini for 11 year old?

My 11 year old daughter wants to wear a bikini to a place called Wet 'n' Wild. The bikini don't show any boobs but it does show a little too much of her butt. I am aware that many boys her age will be there so I'm not really comfortable with her wearing something that shows so much skin. But a lot of girls her age wear bikinis so should I let her or not?

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