OK, yes, the old 34L - that is, the western most of the two parallel runways to the eastern side of the terminal, in between the terminal and the GA area, just of the perimeter road. I've not been to SLC for around six years, so I don't know whether the viewing area is still there...
I just looked on the SLC airport webpage at:
...and I quote from the miscellaneous services
page "Free tours of the Airport facilities and operations can be arranged with advance notice by calling 575-2930"
Might be worth a try...
Also, if you look at:
where the viewing park was (is?) there is still a small lot shown - it is just on the road before it goes right and over the water on the run into the golf course (just to the right, half way down the point showing the location of the golf course).