When are you taking delivery at PCD?
Depending on the way you want to drive back, the amount of time you have, and the time of year, that will give you a few different options. Also depends on what kind of scenery you enjoy and what you would consider interesting.
From spring through fall, going from PCD to Ashville, NC, and then all the way up the Blue Ridge Pkwy and Skyline Drive is a wonderful drive with incredible scenery (especially in the fall). Can't do it in winter due to closures along the way for snow in the mountains.
If you like civil war or revolutionary war history, taking a bit of a detour to go through eastern North Carolina and eastern/central Virginia with let you see battlefields and other historic markers and sites. Then you go through Maryland up to central PA and drive to Gettysburg and then up through Amish country to central NY on up to western Mass.
I could go on but it would all depend on the factors mentioned earlier.