> So basically no 10 uninterrupted miles as asked

well yeah, to be pedantic I should have told them to go to a track or a highway since they're likely to hit a driveway wherever they go.

The Shore Dr 5k circle is the closest thing you're going to find that has sidewalks throughout with the least likelihood of needing to wait on a car.

This is the biggest perpendicular intersection where 90% of the time there will be no need to do more than look both ways.

Another 5k option would be the Newton Hill XC course.