A random non harmful citizen walking using pathfinding

I am making a random guy walking randomly around the map,but couldnt find any tutorials. if you can send me somewhere either a website,a video or something I can learn to make this please let me know (also need pathfinding. and not asking for a full script.)

This will help you with navMeshes, I think it would be a good starting point. Hope it helps you.

http://unity3d.com/learn/tutorials/modules/beginner/live-training-archive/navmeshes

For path-finding try, A* Pathfinding Project

http://arongranberg.com/astar/