Once it starts to warm up, running the loop around the Spokane downtown riverfront. When I was in school at WSU Riverfront campus, I would start the run on the Centennial trail behind the parking area and adjacent condos and go west towards the Riverfront park. On long run days, I would run the loop a couple times and change it up by taking different paths in the park. If you need to add some more mileage (as well as a pretty view), I suggest going into the Gonzaga campus when you are running back east.
Later in the evening, there can be some shady characters in the area, so I suggest running during light hours. 🙂