Tour guide Karima was very knowledgable and had an excellent sense of humour. We went to some famous bars, including one at The Willard, and saw famous buildings including the White House. I wasn't sure how this would work out for me, as a solo traveler, but the others on the tour were very friendly and we stayed out together for some drinks afterwards for a few hours (Ebbitts grill recommended - open late). Would definitely recommend. Only negative is the rather high price ($33 on Sat night) which doesn't include any drinks.
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