Upriver are three walls close together with high quality climbing and impressive geology, well worth the visit. Expect peace and quiet, these walls don't get much traffic despite the quality of the climbing.
Wildcat Wall itself is the main attraction, an imposing palisade of 30 meter columns with excellent cracks (and a few sport lines too!). On the way though, you'll pass by Honeycomb Buttress and the Beehive, a unique pair of crags with primarily sport routes climbing the sides and ends of the horizontal columns. With both overhung and slab routes, these walls can make an extremely well rounded climbing day in combination with Wildcat Wall.
Being further upriver and bring primarily north-facing, these make good walls for extending the Tieton season into the warmer months.
The more popular routes are clean and have solid anchors, though some of the less traveled routes would benefit from some scrubbing and some chains for their bolts (vs tat going to a quicklink). All in all a wonderful collection of rock that should see more traffic.
There are spots for dispersed camping on the road in as well as past the road block, just pack out your trash, manage human waste appropriately, and observe fire bans when in effect.
From Highway 12 turn north onto Wildcat Road (road#1306) just east of Rimrock (on the right/just before town if coming from Naches). Drive up #1306 for 1.7 miles until you reach a road block. Park and look across through the trees to the columns of Wildcat Wall. Continue on foot or by bike along the blocked road, passing by two crossings where the road washed out. After 1 mile the Honeycomb Buttress will be obvious on your right hand side, ~20 minutes from car on foot. There is an obvious trail on your left opposite Honeycomb Buttress, and that will bring you immediately to the two climbs of the Beehive and then a couple minutes further will bring you to the imposing columns of Wildcat Wall itself.
Even on foot, a nice and easy approach without much elevation, well worth it for the high quality climbing on such unique / exciting rock.