how is the walking path invading your privacy?
I mean dose it run along your land so close to your house people can look into your windows, or simply alow people a view of your yard so if you go out side to tan/swim in your pool(if you have one)/kids play people can see it will no problem.
Best you can do is build a fence or other barrier along the path on you land. Depending on law/city ordence you might be able to ge the city to help pay for it.