Good luck over in the sand.  I retired in 89 then got recalled for Desert Storm.  Then came back to find wife had been reassigned to the Pentagon, while I was gone.  So I got to spend a lot of time in the district.  While you are there I know you will see the Smithsonion, but also see the NRA museum just outside the beltway.  Also Andrews AFB, where Air Force One flies out of, Has a good skeet range.  That was the only way I maintained my sanity, I shot skeet every weekend.