Hopping from Alexandria over to Washington, D.C., takes about 15 minutes, and you are capable of do it by practice or metro. On a weekday, pop in to Charlie Palmer Steak — it’s the city’s go-to power-lunch spot and comes with a near assure of “celebrity” sightings . After a couple of gluttonous days within the Holy City, we made the nine-hour trek north to Alexandria, a gem of the D.C. Other nighttime favorites have been The Grey, a restaurant in a renovated Greyhound bus depot, and underground Alley Cat Lounge for drinks. And whenever you add unimaginable marine life…