If you drive all the way to the western side of the park, past Panamint Springs, you can climb to a mountainside turnout and see a small monument and walk to this overlook. In all honesty, it's not so impressive that I would put it on a must see list, especially since it is way off the beaten path from many of the other points of interest in the park. It's a nice enough view that I would recommend it if you do have the time. You can leave your car and hike along a short trail to get an even closer view of the valley below, which might be attractive after sitting in the car for that long of a drive!
Father Crowley Point - Close to the west entrance on Route 190 it provides panoramic views of the Panamint Valley and surrounding mountains. Besides the view there is a monument in honor of Father Crowley (1891-1940).
"From the snowy heights of the Sierras beyond the deep shadows of Death Valley beloved and trusted by people of all faiths he led them towards life's wider horizons."