A nice wall of up to 3 pitches of climbing. The route "Buried Treasure" climbs the fantastic "bilboard" section that is very remenicant of the Fire Wall at Moores.
This is the most up to date and accurate info for this area:
First, follow directions to the RJ that are listed on the main page.
By far the easiest way into the canyon is to rap from the top of Zen Point via the anchors on "Buried Treasure". It's 2 rappels to the ground. It can be reached by taking the razors edge trail down for about 1 minute, and then turning left (about 3/4 way to the small creek) to follow pink flagging. Follow the flagging to the top of the overlook (about 1 more minute). From the point on the left side of the overlook (north), if you lay down and look over the edge -- down and right -- you can see the bolted rap anchors for "Buried Treasure". Scramble down and around to the anchors for the rap.
To get to the bottom via bushwhack (not recommended), locate the small pool of water in the drainage just past (north) the Razors Edge turnoff. Follow this drainage down to the top of "Zen Falls" (which is just a wet slab really) and work your way underneath a small wall with a sketchy move into a gully (fixed pin here). Follow gully a short ways to the base of the walls.
Mountain Project's determination of some of the classic, most popular, highest rated routes for Zen Canyon: