Access specifc gameobject position in array

I'd first, get an array of all Transforms in the scene, then use a Generic List to create a list of all the Transforms in your scene with a specific tag. Use the list count to create your random index int, then assign a new value each time you fire your code. In this example, I used Vector3.up as my offset, because I used a scene with 10 cubes tagged, then one untagged cube to attach this script to, it will act like your "player". Each time you press 'E', your main cube will end up on top of another randomly picked cube from the list. Hope this addresses your question well enough. You'll obviously need to replace "YourTag" for this to work.

 import System.Collections.Generic;
 
 #pragma strict
 
 private var objectArray : Transform[];
 private var objectList : List.<Transform>;
 private var objectToMoveTo : Transform;
 private var offset : Vector3;
 private var index : int;
 
 function Start()
 {
     objectArray = GameObject.FindObjectsOfType(Transform);
     objectList = new List.<Transform>();
     for(var t : Transform in objectArray)
     {
         if(t.gameObject.tag == "YourTag")
         {
             objectList.Add(t);
         }
     }
     index = Random.Range(0, objectList.Count - 1);
     objectToMoveTo = objectList[index];
     offset = Vector3.up;
 }
 
 function Update()
 {
     if(Input.GetKeyDown(KeyCode.E))
     {
         transform.position = objectToMoveTo.position + offset;
         index = Random.Range(0, objectList.Count - 1);
         objectToMoveTo = objectList[index];
     }
 }