Reviewers here say this is a good trail for beginners and I would agree regarding the South Shore Trail and the Northwest Shore Trail. These are smooth single tracks with little to no elevation change. However, I am not a beginner and really enjoy these faster portions of this trail. There are portions of the loop trails that would be quite difficult for less skilled riders and these are mostly along the east and southeast segments of the loop. These have rocks and roots that require some understanding of picking a safe and effective line and short steep portions with quick transitions and some switchbacks that mean getting off the saddle and over the rear tire. Not for beginners without some coaching.
The scenery is hard to beat anywhere: Great views, topography, flora, lake tributaries, and lakeside camping sites are quite soothing and memorable. The quintessential Cascade Lake ride. Oh, I strongly recommend clockwise if riding the loop system of trails...there are portions along the east and southeast sides of the lake that for me are better uphills and downhills when going this direction.