Hey Nora! Thanks for posting. I'm going to assume that you're good to go on streets and sidewalks.
For smooth gravel, it'll be a bit of a drive for you, but you can run for miles on Gold Camp Road. Park in the lot about 1/2-mile above Helen Hunt Falls in Cheyenne Canyon. Also, the Garden of the Gods (yeah, there are a lot of rocks) has some sidewalks and some smooth gravel trails. And Rampart Range Road (begins near Balanced Rock) is smooth gravel. And since you are living out east, I would suggest finding a nice gravel road east of town. I grew up near Calhan and there is something to be said for prairie sunrises and sunsets.