Approaching my eight-year anniversary, I think the main marital challenge I face is weekends. The kids suddenly have hours and hours of unstructured time--this leads to sororal/fraternal conflict. Sometimes, there is a kind of refrain passed from one adult to another: "Oh my God, it's only noon." "Oh my God, it's only one..." My husband--the dad with energy--suggests trips, expeditions. A return visit to a petting zoo. A lengthy drive to "the Castle Playground"--a structure in a rival town. (The slides are surrounded by half-assed plastic "turrets.") By contrast, I think that weekends are for movies and books. Occasionally, an art museum. That's all. I would not travel to a petting zoo if I were a bachelor. Why must I do that now? There is--fortunately--a never-ending stream of mediocre animated films. Yesterday, the family found itself at "Stitch Head," which started strong, then traveled nowhere. My son, sensing the narra...