Hi DD7 and myself are heading up to D.C. via Amtrak on thursday. I have only been there during one day trips, this is a first stay staying there for a few days. The hotel has a free breakfast except on weekends, but I will be taking some cereal for the weekend. Any tips for lunch? I was thinking of making sandwiches and having a picnic lunch at the zoo and on the mall. Any advice is appreciated.