Spring Valley and Ceasar's Creek, along with the other mentioned trails are all great. Just outside Morrow is the Silver Mocassin trail leading from the back of Morgan's Riverside Campground up along the hilltop to Ft Ancient. Follow the marked trail. Great hiking.
I live in Waynesville and also enjoy the Ceaser's Creek area. Everytime we go out there I find a new interesting place to hike. Last week we took the kids and sleds down huge hill on the backside of one of the levi (sp) at the NW corner of the lake.
Try Metro parks in Dayton, it is only an hour drive depending on where you live in the Cincinnati area. They have a lot of trails different trails for just about any type of hike you want to take. I have attached the link below.