Overlook Trail is a 6.7 mile lightly trafficked loop trail located near Bentonville, Virginia that features a river. The trail is good for all skill levels and primarily used for hiking, trail running, and mountain biking.
This trail is part of several loops all of which are well-maintained and with a good mix of flat, hills and a beautiful walk along the Shenandoah River. When my boys and I were there (2/20/17) there were virtually no other hikers so we had the place to ourselves.
The Overlook Trail is actually shorter than shown in the description above - it's about .6 miles and goes from the very nicely done Visitor Center to the Overlook Parking Lot. It hooks up to the Campground trail which is a moderate descent on good paths to the campground area (which is great for trailers, RVs and people wanting to stay in a few quaint cabins).
From the campground, work your way down to the river (there's a road and a couple of short trails) and use the stairs to get you right to the riverbank. We didn't know there were stairs there and went down a relatively steep short path that has been used by a lot of people. The stairs are about 100 feet from there - they're useful. :)
Heading back to the Visitor Center we took the Bluebell trail which is flat as a board and follows the river. It's a very easy walk and the river looks just beautiful. The entire path is shaded.
We ended up taking the Hemlock Valley trail back up to the visitor center where our car was parked and it was a fairly steep incline but not particularly difficult.
If you're not particularly in shape or have ambulatory issues but still want to walk in this beautiful scenery, park in the lower lot (past the Visitor Center) and take the Bluebell trail to the campground. It'll be a nice flat walk of about 1.2 miles in one direction.
I have to say that the Visitor Center here was surprisingly nice. There's an excellent display of animals found in the area and some interactive displays where you can pick up binoculars and look out over the Shenandoah River valley. The Rangers that were there were very friendly, knowledgeable and seemed to enjoy what they were doing.
I'd definitely recommend this set of trails for a short day-hike.