That track is very hard to spot, to locate it look for a rusty pipe(ignore the natural effect) and then turn right from it. If you reach the river you will see it deserved the effort to climb down: it forms little waterfalls and it's really clear - you can see the colorful stones through it - , sadly I didn't spot any fish when i was there, but I saw some men who were fishing near the bridge, so grab your fishing poles if you can!
It is planned for future that Cheile Tătarului will be covered by water gathered by the Runcu barrage, so if you plan to visit this wonderful spot of nature, don't delay it!