This is one of my favourite trails and has been called one of Canada's best day hikes. I have never seen the Coast Trail called a loop nor has it ever been called easy for all skill levels. As an experienced hiker, I don't think that this description is accurate and quite frankly, dangerous.
The Coast trail is actually a 10k day hike. Most people choose to leave a car at one of the trail heads (Aylard Farm or Pike Road) and then use a second car to drive to the second trailhead for departure.
It is normally called a challenging or difficult hike; lots of ups and downs, some scrambling, trail is not always clearly marked, roots/rocks and steep sections.
Allow anywhere between 5-8 hours to complete. The Iron Mine Bay side is considered more challenging and less used. Aylard Park area is well used.
Even though the Coast Trail itself is not a loop, in East Sooke Park there are numerous transverse trails as well two longitudinal trails; the Coast and Interior Trail. Combining portions of these trails makes it easy to create some really great loops.
The trail is beautiful, gorgeous scenery and highly recommend
Levi T. on Coast Trail
Good anytime of year.
See a slide show of the trail here - https://www.youtube.com/watch?v=d59EIOOJhL8
If you have only one day to go hiking in Victoria, I would highly recomend the East Sooke Park Coastal trail. The views of the Juan de Fuca Straight and Olympic mountains are incredible, and in the summer it is nearly tropical with the sunlight reflecting off the ocean. There is a small sand beach at the Aylard Farm end, which is a perfect spot to relax at the end of this epic hike.