Scenic way to the Peace Bridge
Juan, consider using US Highway 62 from western Pennsylvania to the vicinity of Buffalo. I have used this many times, most recently last month, and enjoyed it a lot. Pavement is good, centre-line paint is not wonderful but acceptable, and the route is scenic and sparsely used.
One caveat: 62 goes through Amish country, and the Amish use one-horsepower vehicles a lot, so there is, um, political residue near the shoulders. This is an effective lubricant for tires, so try to keep away from it. I pull in my clutch and glide noiselessly past horses, so as not to alarm them.
I have also enjoyed US-62 in Ohio, but not recently. I liked it ... same warning as I gave for New York applies.
Enjoy your ride.