Two great outdoor options if the weather is nice this weekend:

1. Eastern Market -- Every weekend, this magnificent historic indoor market expands to the outdoors for a farmer's market and and loads of arts/crafts vendors.  The closest thing D.C. has to a European-style street market.  Probably my favorite thing to do in D.C.

2. The H Street NE corridor is one of the hippest newly emerging neighborhoods in D.C.  And it's hosting an outdoor festival 12noon-7pm this Saturday.  Metro: Union Station, then either take a cab or catch the X2 bus at the corner of N. Capitol and H Street.