I'm a little south and west of you. Brown's Camp, Sheridan Peak, Diamond Mill, Sand Lake...There's a few parks in the area. There's also literally more miles of logging roads in various conditions than you can ever drive in a lifetime less than an hour away. Head out Hwy. 6 and grab a road. Have a map and a GPS with you though. It's easy to get turned around up there. On the weekends the log trucks don't usually run, but during the week you'll need a CB to stay out from under foot. Channels are posted on signs, usually, in areas of active logging. On the weekends watch out for bro-dozers and lost Subarus until you get further back. The roads off Hwy 26 are mostly gated. Don't go through an open gate. You might be there awhile.
Then there's heading east to the Cascades or North into SW Washinton.
Seriously, if you can't find exactly the wheeling you're looking for around here, you're not trying very hard. Except rocks. Not a lot of rocks until you get into Eastern Oregon or some places in the Cascades.