As stated best roads in Ohio are south and southeast, although pretty good riding north of 70, east of Cambridge... US-250, 258, 164, 646, 151, 647 to name a few. If your looking for something close to Dayton try OH-503, OH-121 (Wayne Lakes to New Paris), OH-350 (between OH-123 & US-22) 123 ain't bad either, as well as a few others. Little stretch of OH-732 west of Eaton is a little twisty, can be a little congested till you get past Lakengren. A few country roads out that way, Sugar Valley Road from 732 to Camden is one. A ride down to Hueston Woods Covered Bridge is nice. Some decent riding in Germantown area and south, cruise thru Germantown Metro Park. On 123 east of Germantown before you get to Carlise are the UFO houses, they're pretty cool to see. Also some decent county and township roads in that area, don't recall the names off top of my head.
Nice riding about an hour and half southeast of ya in Chillicothe and Hillsboro area. Brown and Adams counties has some nice roads too, OH-221 and Old 68 south of Georgetown are fun. Almost any road going south to the River (Ohio) are twisty.
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