We’ll run the Brighton Rail Trail. We meet behind the Hamburg Liquor Barn. It is out-and-back, so you can do any distance you want. The paved/gravel trail hits Polo Club after a little more than a mile. (Pictures of the trail are here.) Here’s a basic map of that route. (Click picture for link at mapmyrun)
You can turn left on Polo Club and hit Man O’War a little more than a mile later. Or if you turn right on Polo Club, you hit Deer Haven in a little more than a mile. Turn around there and it is 4 miles and change total.
But instead of turning around, you can turn Left on Deer Haven. If you run that out to where it hits Winchester Road, you’ll get close to 10. You can also run across Winchester Road before turning back for more mileage.