The loop through the canyon can be hiked in less than an hour, but you'll probably want to linger for a while. Jennie and I stopped there one afternoon, and unfortunately couldn't stick around until nightfall. I hope we can make it back, as nightly guided hikes reveal the canyon's claim to fame: colonies of glowworms, the bioluminescent larvae of the fly Orfelia fultoni. The canyon in daytime was gorgeous, too: quartz-riddled sandstone eroding into bumpy, knobby formations, walls carpeted in moss, abundant ferns, and cool, hemlock-shaded air offering relief from the stifling heat above. My favorite bit of the trail was the "Witch's Cavern," a maze formed by enormous blocks of fallen sandstone.
Here are some pictures from the trip. Unfortunately, we didn't bump into any Coelophysis.