My boyfriend and I are planning a trip to visit my friend on Cape Cod in September/October for 2 weeks, and are hoping to take 5-6 nights out of the trip to do a road trip down to Washington DC. The plan would probably be to spend 2 nights there, and so probably allow 2-3 days to get there and the same to get back, so that we have time to a bit of sightseeing on the way.
Obviously I know that NY, Philadelphia and Baltimore are all more or less en route, but is there anywhere else you'd recommend to visit? I also have mixed feelings about NY, I've been there already and I absolutely love it, but my boyfriend hasn't and I kind of feel that your first trip there should be a proper one and not just a quick day trip. But on the other hand, it seems a shame not to visit when we're going right past it, given that normally we live on a whole different continent and can't easily just drop in!
Any suggestions would be much appreciated!