KOB,
Head down to the snake river above and below Lower Granite and work the hills on either side. I use to see a lot of muleys when I fish down their. Watch out for snakes and be ready for some serious hill climbs. Another option is to head down to Lewiston/Clarkston area head through Asotin and follow the rattlesnake grade to the Grande Ronde their should be a lot of good hunting back their also. You are also about 2-3 hours from a great white tail and muley area North of Spokane in the Curlew area. Find deer creek road out of Curlew, lots of Logging roads arounds and old pastures hidden in their that are no longer used.