I would recommend only taking the cruise one way. It is annoying that you have to cross and stop at two more places before you head to Mount Vernon. They tell you about the area and different forts on the way. It was nice. However, we were finished before the four hour time to return. Not sure where the metro is outside of Mount Vernon but would probably look at riding back on that next time. The boys enjoyed the ride and there is a concession stand downstairs in the air conditioning. Worth taking to experience it. You leave at 10:30 and return at 5:30. Get four hours at Mount Vernon.
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