Traveling with children, as my wife and I did last week, is, for those of you who have not experienced it, anything but relaxing. A man in the San Juan Airport departure terminal Tuesday, noticing Lisa chasing after our 2-year-old, Ellis, remarked out of the blue that she looked tired. I am sure I am looking tired, too, as I write this on a Delta flight back to J.F.K. After we land, we have at least two more hours on the road.