My husand and I would like to plan a trip to DC in April, 2013. We don't have specific dates yet and are flexible. We would like to take Amtrak into DC and find a hotel fairly close to the station. I think we would like to do one of the hop-on, hop-off tours, and definitely visit the Holocaust Museum. We know NOTHING about DC and need help planning. What dates would be best? What hotels aren't too far from the train station but are reasonable?