There are two ways to reach Center Loop. The easiest would be to follow Creekside Trail. Alternatively, you could reach this loop by following the more difficult Cliffside trail. Hike it in either direction as a lollipop loop to head back to the trailhead, or to add distance onto a larger loop of the trail system and link to Grandview Loop.
Look for some rocks and a bit more climbing as this trail goes higher on the bluffs.