Next summer we are going to NYC, Washington DC and also doing a little tour of Virginia and that region. I have booked a hotel and Airbnb for the cities both nothing for the other part of the holiday. Ds2 in particular wants to drive up to motels like in the films, but can you do this? I was last in the USA nearly 20 years and pre-booked city accommodation then, as I recall, we stayed at a couple of places we drove up to. But it was a long time ago, we had no dc (but mine are 16 and 18, so not little/difficult) and I didn't worry much about cost etc.
I'd love to know what others think or whether anyone has experience of doing this.