We took a one day tour in DC. It was a lot of fun--hopping on and off at different locations. We should have done the Arlington stop first--we got there around 2:30 and were told the last pick up was at about 4:30. Not enough time to really see the cemetery or the changing of the guard. The drivers are entertaining. It was hot though--the trolleys are windowless (June) but it was still very hot. Great tour though if you are new to a destination and are not sure what to see.