A friend and I are coming to Baltimore/Washington April 11-14

My friend Annie's dad is buried at Arlington (as is her uncle) and she's never seen his grave His birthday was April 11, so it seems as good a time as any to visit.
My dad (whose birthday was April 10, coincidentally) and mom were married in Baltimore in 1951 while dad was stationed at Fort Holabird with the CIC. They honeymooned at Ocean City for one night before he got shipped out to what he thought would be Korea, but turned out to be downtown Tokyo (nice break, that).
Mom thought Baltimore was wonderful and always spoke highly of it. I've never been to Baltimore -- except to fly into BWI a couple of times -- and want to see what mom was raving about.
I was stationed at Fort Monroe, Virginia -- at Hampton, not all that far from Washington, in 1974 and 1975 and want to head down there before they close the place in 2011.
I want to go to the ballgames at Baltimore (v Tampa Bay, April 13) and, long shot, the home opener at Washington on April 14 (v Philadelphia).
And I've never been to Delaware. So there's that.
Anyhow, Annie and I have lots of places to go over nine or ten days. What can you insiders tell us about Baltimore or Washington -- or Delaware, for that matter -- about cheap places to stay and good stuff to eat (difficulty: neither Annie nor I touch shellfish and only rarely eat seafood, though I want to eat a crab cake for the first time in my life).
We don't head out for about 45 days yet, so I'll take good notes. Feel free to ask questions about our itinerary.
John
And I'll answer any questions about Saginaw, Michigan that you might have. Thanks to all.

The Cherry Blossom festival in DC will be in full bloom at that time.

In Baltimore, make a point of seeing the inner harbor. Lots of good food and things to do. If you have a chance, spend a day in Annapolis.

BTW, I live about 15 minutes from BWI. There are several DU'ers that are more familiar with Maryland than I am. You might want to post this in the lounge. LynneSin and BeachBaby could give you advice on Delaware/Southern NJ.