We (2 adults, 14 yr. old and 11 yr. old) are traveling to Univ. of Md. for National History Day in June. Planning to fly from KC and don't know which airport is best to fly into. We'd like to rely on public transportation if possible. Is it? Or do we need to rent a car? We will be sightseeing in DC several days while we're there. While this trip will also double as our family vacation, we would like to do it as inexpensively as possible.