Just B, the northern half of East Bank is a great trail - boot-worn for the first 3 miles until the half-mile spur to Hozomeen Lake, then it becomes a lonely little trail that few people take (god knows why) all the way to Deer Lick, where traffic picks up again. The trail from Lightning Creek camp to the top of Desolation is Garibaldi-Lake-grade switchback heaven/hell (depending on your preferences), splendid views as soon as you cross the 'ravine'.
Wowzers, my second time up there in that many years, will return there again for sure. It was hazy up there, likely because of the same fires that you witnessed from closer.
I'll post a trip report later this week, I just finished sorting through the photos that I want to post here (I took over 580 that week). If you want a multiday walk with much solitude (we only encountered 4 people while on our way up from our car to Desolation!!) this would be a very good choice. Camp Nightmare is an absolute misnomer, wish we had stayed there.