If I was going to show up in person and protest.. I think my first choice would be outside of Washington and probably on the trading floor of the NYSE. Since we are bound my no laws in this "subjective" and "figurative" question, I think that would get the most bang for the buck so to speak.
Threaten the real current "driver" of this country.. the money. It would get more attention than streaking across the White House lawn. ;)
ii. Would probably be tied to the White House is some fashion, but I think I would do some recruiting first at Georgetown and George Washington University.. politically charged students itching for a cause may make an motivating scene if done correctly.
iii. Probably wouldn't be the more effective one, but something like at the feet of the Jefferson Memorial (Or the Constitution Gardens). Since I believe the we have lost sight of the constitution of this country, I would hold it someplace such as this as a backdrop. Again.. it probably wouldn't be effective, but to me, it would be more meaningful than any place where office is being held currently by those that have lost touch with the constitution the most.
Personally.. I would rather launch a viral campaign with a rollout similar to Kony, but instead of violence as the underlying theme I would choose topics like poverty, declining health care and the common struggles of your average American family in a declining America; painting those in D.C. as the tyrants upon the forgotten American way.
As far as visiting D.C.... other than the "The Wall", Arlington,and the other war memorials and maybe a couple of the landmarks of generations ago.. I would have no interest in going there on vacation. Library of Congress and Smithsonian probably would be on the list as well.
"The oranges are dry; the apples are mealy; and the papayas... I don't know what's going on with the papayas!"