This time of year, some parents with school-age children begin to sound like classic backseat whiners: “Are we therrre yet?” Many youngsters have already filled the early days of summer vacation with fun-in-the-sun musts: Summer camp? Check. Pool parties? Check. Visit to the grandparents? Check. But now, with the July Fourth holiday in the rear-view mirror and more hot days of summer still ahead, boredom and “brain drain” can become another summertime rite of passage. Or not. Trying new things, heading outdoors for missions both planned and unplanned, tasking the imagination and repeating a favorite class or camp are all strategies parents can use to keep kids from becoming zoned-out screen zombies before the arrival of the new schoolyear. And, it turns out there ma...