Arlington was the most unbelievable site. The cemetery was not extremely busy but if you are looking for a more personal experience I recommend arriving there early in the morning to miss some of the crowds. A day trip. Visiting the Tomb of the Unknown Soldier is a must. I recommend walking around all of the tombstones and wandering off the path. I remember one in particular. They were two brothers who were buried next together. On their stones each of them had four engraved stars representing that they were four-star generals. They were among the thousands of heroes resting in peace there. If you do go to Arlington please respect that it is a cemetery and that many of us have family members resting there. It is not a place for your children to run around.
Pros: free, good excersise, life changing