Accessing boolean properties from array of transforms

I am trying to make a script in which the characters( goats ) jump from spot to spot. I have an array of transforms which are jumpspots. The thing is that I only want them to jump to spots that are unoccupied so I am wondering how to do that. I have tried making another script for each transform with a boolean that indicates its state(full/empty). I want to make ScanForTarget function to only look for targets that are empty. I imagine that I need to make a new array ( one that has only empty spots )from the possibleTargets array but am not sure how to proceed.I could not work out how to check the possibleTargets boolean states. Also , how can I make to the (transform.LookAt(target);) move through a smooth rotation?it is instantaneous at present. Thanks.

 var front_switch : boolean;
 var customButton : GUIStyle;
 var possibleTargets : Transform[];
 var audioGoatObject : GameObject;
     
 var other : Rigidbody;
 var searchTag = "Respawn";
 var smoothTime = 0.3;
 private var velocity = Vector3.zero;
 // the frequency with which to re-scane for new nearest target in seconds 
 // (set in inspector)
 var scanFrequency = 1.0;
 
 // the current target
  var target : Transform;
 
 
 
 
 function Update() {
     // we rotate to look at the target every frame (if there is one)
 
     if (front_switch==false){
         transform.LookAt(target);
         var targetPosition : Vector3 = target.TransformPoint(Vector3(0, 0,0));
 other.useGravity = false;
 // Smoothly move the camera towards that target position
 transform.position = Vector3.SmoothDamp(transform.position, targetPosition,velocity, smoothTime);
 
     }
 }
 
 function ScanForTarget() {
     // this should be called less often, because it could be an expensive
     // process if there are lots of objects to check against
    target = possibleTargets[Random.Range(0, possibleTargets.length)].transform;
 
 }
 
 
 
 function OnGUI(){
  if(GUI.Button(Rect(50,Screen.height -150,Screen.width/10,Screen.width/10),"",customButton)) 
  {
  ScanForTarget();
 jump();
 audiojump();
 }
 }
 
 function jump(){ 
 
 animation.Play("jump");
 yield WaitForSeconds(1.5);
 animation.CrossFadeQueued("loop_goat");
 }
 
 function audiojump(){
 
 audioGoatObject.audio.enabled=true;
 yield WaitForSeconds(1);
 audioGoatObject.audio.enabled=false;
 }