Tahuya is close to you. It's out by Belfair. Most of the trails are very easy for a stock rig, but there's a couple of hill/rock climbs that can visit some pucker and clumsy. Tahuya is open year round, I believe.
The Naches Trail closed on November 15th, and Evans Creek ORV Park just past Wilkinson closes December 15th. Both reopen next summer.
The Naches is very easy, even for a stock rig. But it's in the mountains, and conditions there change lickitiy split. What was doable yesterday with an open/open rig, is no longer doable by a locked/locked rig on 35's. Summertime is the easiest. Fall/Autumn is when it can be really fun!
Evans Creek has trails from mild to wild. And on most of them there's at least one spot or obstacle that can visit some pucker, and/or damage. Once again, going with a well set up rig, and someone you trust who knows the area is key for the first few times. That's how I see it anyway.
Elbe Hills is open year round. The trails there run from easy to "wholly crap! What'd I get myself into". Lots of full sized rigs and buggies visit Elbe Hills. So the trails get torn up, and change all the time. As I said, there's some easy stuff out there, and some definitely tough stuff out there. If you visit Elbe Hills, go with someone you trust, that knows the area.
Don't know much about Walker Valley. Been there twice, but not with anyone who knew where to go. It's on my list of places to explore next summer.
Here's a few links to some of the trail write-ups I've done here on Jeep Forum. Haven't posted a run on here for a year or so. That said, I've been on a few in the last year or so. Also, in all these threads I was on a d30/Aussie/d35 PowerTrax. I still run a d30/Aussie, but now have a d44 out back, flat belly/tummy tuck and a few other things. But, it's essentially "stock". Kudos to Modern Classic Enterprises (MCE) a.k.a. Flexible Flatties.
Evans Creek; http://www.jeepforum.com/forum/f313/...012-a-1441087/