Things to do in Maryland & DC (aside from the obvious)

National Aquarium in Baltimore

Lots of fish.  Really cool.  And you can visit the inner harbor on the same day!

http://www.aqua.org/

Nationals Baseball Game at the new Nationals Park (Openning this year)

The Nationals are inaugurating a brand new stadium this year.  The picture above was from the old RFK stadium

http://washington.nationals.mlb.com/index.jsp?c_id=was

Hike at Great Falls

A beautiful hike and a gorgeous setting.  Too bad this picture was taken with my cellphone.

http://www.nps.gov/grfa/

National Air & Space Museum II (at Dulles Airport)

If you have already checked out the museums on the mall, this one is a good one to go to.  You can see the space shuttle Enterprise, the Concorde, the Enola Gay, and many other unique aircraft.  Free admissions but parking is $12/vehicle

http://www.nasm.si.edu/museum/udvarhazy/