The entrance to the Chestnut Ridge Loop Trail is located at MP 120.5 on the Blue Ridge Parkway. Take the Mill Mountain Parkway for about a mile and parking for the trail is on the right. Bathrooms are available at the Mill Mountain Visitor's center at the top of Mill Mountain. This trail is a local favorite for trail running.
I believe this is the chestnut ridge trail which you can access via the parkway, Yellow Mountain Rd or from South Roanoke at Fern Park. Its a nice easy hike but extremely accessible. The nature trail spilt off is worth checking out. Dog friendly and surprisingly not crowd considering location.