Allow them to be bored, out of it comes creativity. We used to have one day a week without any tech and they build dens in the woods, built a raft for the river and came back soaking wet, they played D&D with pen and paper. You have to give them the freedom to be bored, get filthy, get lost, covered in art stuff. Also, that kid from Mesopotamia probably had chores anytime he looked bored.