No Hail Mary's required
Overview: A true loop with many spur options, this is found at the northwest corner of Arches National Park.
Warning: This is a desert hike and can take several hours so bring plenty of water. If it rains the east half of this trail could be difficult due to climbing sections of slickrock slopes which you wouldn't want to do when they are wet.
Hike: Drive to the trailhead and park in one area of the immense lot. From the restrooms and trailsigns there is only one entrance path. The first third of a mile or so is mostly paved for wheelchair access and leads to landscape arch. Only 1000 feet in there is a short trail on your right, take this to look at pine tree arch and tunnel arch. Return to the main trail and admire landscape arch.
That's the easy part and you could return to your car having hiked less than a mile total. However, since you've gone this far, you'll probably want to take the primitive trail which adds a little over 4 miles, which can grow to about 7 if you exercise all the spur options.
Assuming from landscape arch you continue a steep hike/climb north at the primitive trail sign, you will be doing the loop clockwise as follows.
After a thousand feet, a spur branches off the the west. Take the spur and it splits again. The first spur to your left goes to partition arch, the other to Navajo arch, each are about 800 feet each way. Return to the primitive trail.
Continue climbing, follow the ridge of slickrock. Where you get cliffed out look for some carved out steps in the slickrock below you on the west side. After about a mile of hiking you will reach the double o arch area. It is located over the ridge to your west. Descend through the ridge on the cairned path. You can also from this point take the spur trail directly to the base of double o arches and further on to dark angel rock, a blackened hoodoo about a third of a mile each way. Return to the primitive trail.
Continue north through the boulders until you notice the top story window through a fin to your north. Here you will notice a signed spur for fragile arch, which goes southeast for about 1200 feet each way. Return to the primitive loop trail. Continue northeast and then southeast. This is by far the most difficult section as there are some steep climbs over some slickrock slopes. Finally you will reach the sandy area and slog around the rest of the loop another 2 miles until you arrive back at landscape arch. Return the mostly paved path southeast to your car
Exercising all of the spurs will net you 8 miles total. Other than the sand the hiking is fairly easy although if you have an extreme fear of heights you may have trouble in sections.
Water sources: none, except for some muddy spots
Camping: none allowed in Arches
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.