When tweens break family rules (sneaking out to a party, for instance), they learn that their actions have consequences. A popularity queen torments her peers by cracking jokes at their expense and intimidating them, but others' self-confidence usually puts her in her place. Body-related humor -- like farting and a character smelling the contents of his belly button -- is common.
Very brief instances of kids slapping or pushing each other, but it's understood that it's comical in nature.
Tweens and teens often are giddy in each other's presence, and a main character has a hard time masking his crush on his classmate, but there's no physical interaction.