Practice Slab at Garden of the Gods has some easier rated 5.4~5.5 routes. It's an easy access to set the top ropes. Also Grey Rock in the park is a good easy slab but the access is a little more sketchy. Not a climb but a tougher scramble.
If you're willing to drive a bit Castlewood Canyon S.P. is pretty much where most people take new climbers. A lot of easy routes and the access to set top ropes is easy. Look for the Grocery Store Wall and Neanderthal Wall near the west entrance to the park, the northwest cliffs along the Climbers Trail.
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