In addition to the great views of the city's skyscrapers, the main points of interest are the various bridges you pass under, most notably the aerial and suspended Margaret Hunt Hill Bridge:
I like in particular the huge flags on each side of the viaduct which look like a border between Texas on one side and the United States. Pun intended given the current nasty arguments about building a wall with Mexico...
On the South side, here is another elegant bridge, also named after a Margaret, the Margaret McDermott Bridge which is set to open this year!
Tramell Crow Park (under the bridge of Sylvan Avenue):
I went on for 3.5 miles North of Commerce Street and it seems like the trail keeps going for a few more miles.
Again, pretty straightforward way to log some flat miles in if you are staying in one of the many hotels in downtown Dallas.
PS: at the end of my work meetings, I discovered these flocks of great-tailed grackles covering the trees and making so much noise, see this video: