From the old white wooden country store that is back there in Smoke Hole, take the gravel USFS road (maybe 95?) up to the top of North Fork Mtn. Continue out past the towers and continue on dirt to the microwave relay antenna and you get a view of Seneca Rocks.
I lived there in the N Fork Valley for 6 years and have played there for over 20 years. The riding is very very good!!!
And if you liked that road, check out the loop you can make with Smoke Hole/221/33/and Smith Mtn Road. Endless riding...