ORV park for snowmobiles? the only thing i can think of is the snow parks up on the other side of stevens and snoqualmie pass... and they don't really allow ATV & dirtbikes up there, even after the snow's gone(then it's forbidden).
as for ORV parks & riding that has less rocks, there's thurston county ORV which closes down in the winter(oct-feb i believe) to ORV. then there's tahuya state forest over by belfair, it's not near as rocky, but has tight tecnical trails for ATV's. over by moses lake is a dunes area, about 2000 acres of open sand dunes. another smaller dunes area is located outside of beverly, is about 300 acres.
then there's horn rapids ORV, outside of richland, which has open desert riding, and tracks for quads, dirtbikes & 4X4's as well as a kart track and sand drag strip. areas i've never been to: walker valley, evans creek, & many others down in the southern part of the state.

 

Hello again,

The ORV park the guy told me about is called Walker Vally. I had it writen down Im my truck...

 

A buddy and I will be at Beverly dunes this Sunday, around 9am if anyone is interested. I'll be on a Raptor and my buddy rides a Warrior, driving a green Ranger, black trailer. One day is all you need to see every square inch, but it's still a blast. SAND!!!!! It's why quads were invented. Don't forget your flag.