A civil war trek would be pretty cool. There's Gettysburg, there is Shanksville, Pa where the plane went down on 9/11 ( nice tribute), in Philly there is Independence Hall, the Liberty Bell, The Betsy Ross house, NYC there is the Statue of Liberty, Ground Zero, FOA Schwartz with the big piano keyboard you step on (for those that remember the movie Big) then there is the theatre district in NYC, lots of on and off broadway shows, ooh Carlos Bakery in Hoboken Nj, a stones throw from NYC ( cake boss), there is a cake boss bakery in NYC but you are more likely to meet one of the siblings in NJ than the satelite bakery in NYC, there is Salem MA, cool graveyards and tours telling of the Salem witch trials, Lots of Lobster in Maine, get them right off the peers for about $3-4 each (soft shelled, won't make the trip home though), I'll let you know what else I think of.....