We were camping in Yakima, WA last year and the park filled up with many families that all seemed to include 10 - 11 year old boys.
Several of them started to go across to a field to play catch, when they noticed that they would be crossing our campsite, stopped, and started to walk around. We told them that they were welcome to take a shortcut through our site (it was very large). We had a nice conversation with them, and found that they were from N.Wenatchee and were attending a baseball tournament.
They were the nicest, most polite group of boys ever!
Have a great trip and enjoy the tournament.