Head South to capital forest/Straddleline ORV (olympia'ish) or cross the narrows bridge and hit Tahuya state forest (Belfair). Or you can jump over the pass and go to Naches and Gifford-Pinchot National forest. If you want Desert drive 4 hours East and hit Odessa, Green Dots (Vantage), or Juniper Dunes (Pasco).
Also- Try calling Jeff at Tasky's Metric Cycle (everett) to get some more riding area recommendations. He is pretty in-tune with the area and a good small shop Berg dealer.