+1 on P20's suggestion - the Delmarva is FLAT and many of the roads on the Maryland section of the Eastern Shore, at least, have well-paved shoulders. I've ridden sections around Salisbury to Assateague (Seagull Century) and sections up in Kent County. I would avoid US 50 and 301 if you go that way. Bikes are prohibited on the limited access highways, so stay off I-95, for example.
I'd also ask in the Touring forum - there is a bike route up the east coast thru the Richmond area, and you could use the route the Jamestwon-Richmond ride uses to get there. I would also post in the SE and NE regional forums, where you will find people with local knowledge or routes around the major cities.