The cemetery is of course amazing, a must see. The tram tour with grayline was terrible. Trams "every 15 minutes" were at least every 30 minutes. If you can walk, you should, as you will otherwise spend a lot of time standing around waiting (and hopefully in the shade, if you are lucky)
If you own or manage Arlington National Cemetery, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.