Don't know if you'll be mobile, but in Baltimore proper, not too far from BWI airport, is the quintessential crab house called Bo Brooks. Haven't been there in about 15 years, but here's what I remember:
Long picnic tables with butcher paper. One can order 3 or 6 or 9 blue crabs, which are the size of two hands. You also get a wooden mallet & a bib. I ordered & was served 6 blues, an order of fries, 2 Buds and went to work. Hammering, picking, eating, drinking, making a huge mess and not caring. Before long I had gone through 5 crabs. I hammered the sixth and immediately hit the wall--I literally waddled out of there.
What a feast!
Bo Brooks
2701 Boston St.
Baltimore, MD
410-558-0202
www.bobrooks.com