Sandra - Hi!
If you are stopping in Greenboro - you would have to take the I-77/79/95 route, which at the time of year you are going wouldn't be a problem.
Actually I like that route much better - much more scenic and a little bit faster. (However, I agree don't do it in the winter)
We usually stop at Beckley, WV which is about 8-9 hours from Toronto. We have stayed at a few hotels there, but the one the kids like the best is The Country Inn & Suites at Beckley. They have a huge indoor/outdoor pool that the kids love! I found their best rates are their internet rates - so you'd have to book ahead of time.
You could always drive down that way and come home I-75.
Happy planning!