When visiting the the Grand Canyon you definitely want to view and photograph the beautiful sunsets at the canyon. If staying in town the best way is to take one of the park buses as they can drop you off at a number of good location. I would advise you check out the bus schedule as they are subject to change.
If you are ever traveling to NW Florida one of the thing to take advantage of in the area are the sunsets. The area along the beach gets some of the most beautiful sunsets you will ever see especially at Pensacola Beach. Oh remember to bring your camera to save the memories.