Where are bathrooms located along the drive?

Look for the lines of people. That's where you'll find them

I saw two one spot had port-a-pottys and one gift shop had rest rooms . we came through rock fish gap entrance and left out of the switf run exit. So they had enough along that route..

If you are coming from Front Royal, it will be about 4 miles from the park entrance to the Dickey Ridge visitor center.