I think one thing that scares people away from gravel rides is the idea that the realm belongs to the ultra riders of events like Dirty Kanza 200. That is so far from the truth and we're right in the middle of dozens of loops that are opened up once you have the appropriate bike.
One such loop is Sugar Run. It can be accessed via County Line Road on Bent Mountain. Stay on the road past Amreihn Winery to where you turn left at Kings Road. Kings turns to stretch of gravel for most of the loop. Take a left on 644 (still gravel) back to County LIne Road. If you park at the church on 221 just past the road it is about an hour loop, possibly the best hour in the area.