We camped with friends and had a similar situation. On one trip we numbered more than 15 kids.
My heart still beams over the time a gentleman approached us at the close of a campout to say that he had dreaded the start of the trip when he realized we were all there (reserved sites). At the close of the trip he wanted to congratulate us on what a pleasure our collection of kids was. :)
It's nice when someone goes out of their way to pay a compliment. We made sure the kids knew that GOOD behavior is noticed and appreciated as well.