The North Fork of the Snoqualmie River has no wheel'n areas that I'm aware of and I've been going up there for 30 years. And my dad 30 years before me.
It's simply a gravel forest road that gets way back into the hills. About 16 miles back it crosses onto Federal Snoqualmie-Mt. Baker National Forest land. On the federal land there are one or two hiking trails, some nice places to camp not far off the gravel roads (yet with very little people back there so it never feels crowded), some BIG near-old growth trees, and beautiful places to check out the North Fork of the river.
Along the way up the gravel road passes through logging timer land and some old bridges. Most of the side-roads that wander back into the timber land have been barricaded for vehicle entry but you can still walk around the gates if you want a hike.
And at the Spur 10 gate there is usually a dude from Weyrhauser (sp?) to keep an eye on anyone trying to get off the main road. I "think" you can travel Spur 10 but you need a permit or pass from Weyrhauser, that area is their land as far as I know (or land they are leasing). Spur 10 gets you up onto some mountains where there are some small lakes up there. Some day I'd like to check it out but it'll take some research on my part on who I need to contact (if I can even go).
There's no wheel'n but it's a nice place to camp or go for an easy day-trip / picnic or to do some target shooting (way back on the Federal land).
This summer I want to take my son up there (he's only 18 months now) and just do some easy driving with the top down to see how he likes riding in the Jeep with dad with the top down.