Make NavMesh move to random positions

 Vector3 finalPosition;
 
 Vector3 randomDirection = Random.insideUnitSphere * walkRadius;
 
  randomDirection += transform.position;
  NavMeshHit hit;
  NavMesh.SamplePosition(randomDirection, out hit, walkRadius, 1);
  finalPosition = hit.position;
 
 (I found this on another question)