We are planning to go for 5-6 days round trip from DC to Niagara falls round trip by car (2 people but only one driver). Which are best scenic routes on the way? I was considering : Gettysburg- Harrisburg- Susquehanna- Finger lakes-Niagara to get there. But the way back is still unclear. Shall we go all the way through Philadelphia (or Pittsburg)? What are good sites recommended to visit? What are options for making stopover and places for staying on budget (Motels or Airbnb)? Any other recommendations would be great.