West of Marysville, south of the Honda plant lots of nice semi-twisty roads. Not the same as southern Ohio, but its nice.
Lots of covered bridges around North Lewisburg, Milford Center, etc.
Northwest of Marysville around West Mansfield, Zanesfield and Bellefontaine, though thats getting more into NorthWestern region.
257 from Columbus following the Scioto River north toward Prospect is decent.
315 north of Columbus following Olentangy River to Delaware even better.
Some neat stuff around Sunbury/Galena area.
Mohican/Malabar area farther north near Mansfield lots of nice backwoods roads.
All of these you have to get off the beaten path on the little back roads.
Not any long twisty routes that are good for 100 uninterrupted miles of in-the-wind Bliss.