How go-go precocious is Judy (Jordana Beatty), the tween heroine of Megan McDonald's book series? She's so manic she thinks summer is boring. To avoid a bummer summer, she assigns ''thrill points'' to various activities that all end up disasters: She falls into a river while tightrope-walking, gets splattered with Sno-Cone barf on a roller coaster, etc. The lesson is that fun can't be planned, but the film is so airless (think iCarly as a videogame) that there isn't a truly playful moment in it. C–

