The Watchman Trail is listed as a moderate hike in the Zion National Park Hiking Guide with a distance of 3.3 miles and an elevation change of 368 feet.  I think a lot of people may take a pass on this trail because it kicks off right from the Visitor Center.  However, I liked the trail and its scenic views of the Zion Canyon and beyond. Here is the Trail Map and several photos taken from ground level or from a very low elevation at the beginning of the hike.  As you may know by now, Zion National Park is a beautiful place.