The dog ate my homework. I did not have sexual relations with that woman. I was driving along the coastline of Argentina. Who among us hasn't used one of these clever excuses when confronted by a displeased teacher, testy Congressional committee, or angry electorate? South Carolina Gov. Mark Sanford went AWOL last week and used that last bit about a jaunt along the South American coast to cover for his whereabouts. Allegedly, Sanford chose Buenos Aires as a more "exotic" destination than his first cover story of unreachably hiking the Appalachian Trail. Exotic like that drive along Argentina's exotic coastline. So exotic, in fact, that it was exotic even by Argentine standards. If you look at a map of Argentina, it might seem that there are endless coastal roads, with crashing waves and sandy beaches. But in actuality, the majority of roads run inland and eventually turn off at coastal towns. Maybe he was referring to the few miles of road along the Buenos Aires coastline known as La Costanera, which are dotted with carritos (street meat carts) and a few restaurants. In that case he could have used our handy Buenos Aires guide and dropped by Los Platitos for a steak while he was at it.