A couple of years ago (prior to baby #1), my wife and I took a weekend trip to Washington D.C. Spent 2 nights in the city (1 at a generic Marriott and 1 night at the Park Hyatt). We managed to secure an upgrade to a suite for $45 same-day at the Park Hyatt, more than worth it!
We flew Southwest non-stop from ATL both directions as we managed to secure a really cheap flight. Nothing special to report from the flights.
Some pictures from our trip:

GW Campus

Scene from behind the White House

Street scene from Georgetown

My wife and I in front of the U.S. Capital

Bedroom of our suite at the Park Hyatt D.C.

Living room of our suite at the Park Hyatt D.C.

Bathroom of our suite at the Park Hyatt D.C. Deep tub to the left and stone surround shower on the right.

View of Atlanta on descent into ATL
Really fun weekend with some great food and 1 really nice hotel (Park Hyatt D.C.) + 1 mediocre hotel (Marriott Washington – Georgetown). Some of the restaurants we enjoyed:
-Mintwood Place (Dinner – Really solid)
-Le Diplomate (Brunch – Highly recommend)
This was our last trip before baby #1 was born, little did we know how our life would change (for the better!).