"Go see Bachman Lake"
Northwest Highway is also known as Loop 12, although nobody in Dallas calls it that(also, it's not actually a loop, which may have something to do with it.) On the west side of NW Highway is Bachman Lake, which is a really lovely spot. You can walk or jog the entire perimeter of it to get some scenic exercise. There's also a really cool-looking muffler man just across the street from the lake if you dig that sort of thing. It's a nice place to visit during the day but probably not someplace you'd want to go at night. I once ran into an old man at the Whataburger next to the lake who told me the city will never drain the lake to clean it because they're afraid of finding dead bodies and having to investigate who they were. But I think he was just shooting his mouth off.