I believe the trail you're talking about was off the road between the harambe area and asia, behind the tree of life. We were just there two weeks ago and I believe this trail is now close off(not 100% sure on that though)
I read somewhere that it is near the Chicken Shop food cart in Asia. You go down the path and if you find stepping stones thru a brook, you've found it. Sorry to hear it is closed. I wanted to surprise my kids with this. We like to hike!