The Citadel hike shares a trailhead with The Seven Kivas Trail. If you have to park out at Cigarette Springs Rd it will add 0.6 mile each direction to the hike. The Citadel hike takes off from the Southeast corner of the trailhead. It is an easy trail that is well established, cairned, and easy to follow.
This is a pleasant hike along the canyon rim with little elevation change until the prize at the final approach to the Citadel. The trail comes to a downslope of slickrock. Keep a watch out for cairns marking a down climb on the right. This involves some scrambling. There is a minor arch on the left as you continue to down climb following the cairns. It can be a little unnerving if you are afraid of heights. You can now see the narrow stone causeway with the rock island in the distance.
Your mission should you decide to accept it, is to walk the stone causeway out to the rock island and visit the Indian Ruins. When you arrive at the island of rock, I suggest you hike completely around the island, then decide if you want to go up to the next level and visit the Indian Ruins. Also watch for Indian Head boulder on the ruins level. When done return the way you came.
WARNING! Hiking and outdoor related sports can be dangerous. Be responsible and prepare for the trip. Study the area you are entering and plan accordingly. Dress for the current and unexpected weather changes. Take plenty of water. Never go alone. Make an itinerary with your plan(s), route(s), destination(s) and expected return time. Give your itinerary to trusted family and/or friends.