There has been some great points here so I will just add this.
What ever you do make it clear what the rules are and what will happen. After you do that stick to what you said.
Every year at my camp after everyone had dinner we would break into the younger kids 12 and under, older boys, and older girls. Each area head would give very clear rules on what is expected.
The teen girls and boys directors would switch after a bit and talk about the PDA rules and how boys are not allowed in the teen girls area of camp. We really found having a motherly figure lay out the PDA rules and the restrictions on the girls area worked really well.
