For driving instructions to the trailhead refer to the Devils, Flume, Pollock Bench, and Rattlesnake Canyon Trails
portion of the Getting There section.
Flume Creek Canyon makes for a very easy hike with nice scenary. There is minimal elevation gain and it's not very long (about two miles each way).
When you start out at the trailhead take a right at the first fork in the trail only a hundred feet down the parking lot. The trail loops around a small hill and then you can see a small dry streambed down and to your left. When the trail forks again keep left so that you descend down to the streambed. The trail follows the streambed for a couple of hundred yards until it officially enters BRCW. At this point the trail leaves the streambed and climbs up onto the hillside to the west of the canyon. Don't follow the trail - stay in the streambed.
The canyon narrows dramatically for several hundred yards and then opens up again. You can follow the streambed for another mile and a half or so until it terminates into two box canyons with 100 ft near-vertical walls. I suppose that these walls may be scalable with the correct gear and knowledge - we had neither.
If you're going to hike up to the where the canyon ends in 100 ft vertical walls all you need is standard hiking gear. If you plan on scaling the canyon walls you'll need climbing gear (I wouldn't know what that is). In the summer plan on bringing plenty of water as you'll not find any along the way.
Also the very narrow part of the canyon is probably not a good place to hang out during a downpour due to the risk of flash flood.
If you have information about this route that doesn't pertain to any of the other sections, please add it here.