Jacki,
when are you traveling to the WA-DC area? Sorry if I missed that in your orig. question. When we went 2 yrs ago, the metro was so very easy to navigate, and clean, clean, clean - food and drink are not allowed, not even bottled water. So many of the museums are free it's a really affordable vaca. Do you have children traveling with you? My son loved the International Spy Museum, ($) but that was the only one we had to pay for. you could google local quilt activities based on when you're here.