Tell your campers stories. Give them the rich gift they are missing when they stare at a screen. The stories do not need to be great — just tell them.
By the time your campers arrive, you will be oriented to how camp works, what is expected of you, and how to manage some of the camper challenges that you will inevitably face — like homesickness and bullying. If you want to be a really good counselor, listen carefully to what they tell you, really learn what they teach, and put all of it into practice.