How to make AI wonder about? C#?

Game Development @ Tuts+ has more than you'd ever want to know about wandering:

http://gamedevelopment.tutsplus.com/tutorials/understanding-steering-behaviors-wander--gamedev-1624

it is really easy to do so;- 1- make a cube and remove the mesh render component, now create your monster and give it nav mesh agent component, finally create a c# script and set the monster destination to your cube.

code:-

          using UnityEnigne.AI; 

          public NavMeshAjent myAjent; //your monster, make sure it has nav mesh ajent
          public Transform Ajent_Destination;// your cube
          public Transform temp_playerDestination;// you i mean the player

          private bool isChasing_PLayer = false; 


          void Update()
          { 
             myAjent.SetDestination(Ajent_Destination.position);
            if(isChasing_Player == true)
              {
                    myAjent.SetDestination(temp_playerDestination.position);
               }
             else
              {
                  myAjent.SetDestination(Ajent_Destination.position);
               }
           }


         void OnColliisonEnter(Collider other)
         {
               isChasing_Player = true;
          }

Now we only need to teleport the cube , make sure it has box collider with is trigger set to true make another c# script name it as Collide and ,,,,,

code:-

        public int min_X = 0;
        public int max_X = 0;

        public int min_Z = 0;
        public int max_Z = 0;

         void OnColliisonEnter(Collider other)
         {
             this.gameObject.transform.position = New Vector3(Random.Range(min_X , max_X) , 0 /*you can modify this thing by creating min,max variables for Y*/ ,Random.Range(min_Z , min_Z ));
          }

And you are good to go, hope this works I haven't tested this script in unity so please just check for spelling cause this surely goanna work , leave the comments for any suggestion or query well this is my first ever unity solution and I am programming for a month now!!!!