Seeing the Southeast

On Monday, the boyfriend and I are setting out on a thirteen day road trip. Places we plan to hit are Savannah, Louisville, Washington DC, Atlanta and maybe Nashville. Although I have done plenty of reading, map-staring and bookmarking, we aren't being too rigid in our plans. We figure we will just plan each day the night before. I think we each have some specific things we want to see, and apart from that we will just go with the flow. My must-sees are the National Mall, Giant Pandas (probably in D.C., maybe in Atlanta), the historic center of Savannah and at least the outside of the Parthenon in Nashville. A riverboat ride would be cool, too, and it seems like most of the big towns in the South have them.