While viewing Double O, there is also a good view of the pinnacle called Dark Angel. Just before arriving at Double O arch there is a sign pointing out the view point for Black Arch. It is hard to see the opening of Black Arch as it is always in shadows.
The upper opening of Double O Arch is about 66 feet wide. The area below the arch is very sandy and the walking is a little difficult. The lower opening is large enough for several people to stand in.
There is a sign at the start of the Primitive Loop cautioning hikers that the hiking is difficult. Along this first section the trail is fairly easy walking and up ahead is a side trail to Private Arch.
Just below Box Arch is the one really tricky part of the trail. There is a slanted narrow ledge above a drop off that was a nervous area to get across. I leaned far to the uphill side and stepped very carefully to the point where I could slide down to the bottom. It looked like this would be a slippery and hard spot to climb up if you were hiking the loop counter clock wise.
The trail continues in the wash for a ways and then a sign directs you out of the wash and back onto an easy to follow trail. The sand is loose in the last stretch making the walking a workout.
The views along this section are back towards the many towering rock fins. There may be some arches to find hidden in the fins but there aren't any more signs or obvious side trails.
Keep an eye out for Crystal Arch to the east, about 5 minutes northeast of the junction of the Primitive Loop and Landscape Arch. (Separate Post for Crystal Arch, use labels to find.)
The Primitive Loop rejoins the main trail at Landscape Arch and there is a different view of it as you approach the trail junction. My total hike was about 7 miles and took 3:20 hours. I carried 2 liters of water on an 85 F degree early September day and drank it all and needed a big drink when I finished.