Everyone, young and old, was trying new things, and there were some milestones. Sometimes, that involved trying new foods (I refuse to capitulate to some kids' desire to eat nothing but junk). Other times, milestones were found in learning new skills or gathering up one's courage to jump off the dock a little farther than ever before.
In a widely-graded camp, learning to accommodate each other is really important. Younger and older kids mix together, and everybody joins in the fun. Bible study has to be pitched to allow for an easy grasp; luckily, easy doesn't preclude the profound. We studied the creation stories (Genesis 1-3). Everybody took turns saying grace before meals. On our last night, we celebrated Holy Communion.