Here is a link to a description of each of the bridges. On that page is a link to a map to all of them, and the nearby wineries.
http://www.coveredbridgefestival.org/Pages/bridges.html
Last year, we drove to Geneva-0n-the-Lake and stayed two nights at The Inn. This was a gift from our daughter and new son in law for paying for their wedding. Sort of a cash-back reward. :) We wandered town (which was empty that time of year), walked some of the State Park trails and beach, went bridge hunting (photos of most on my Facebook and Instagram linked in my sig) and sampled some wine. A Wonderfull weekend getaway!!
Note that most of the roads are paved, albeit very narrow, curvy, and crowned, with a few gravel roads to get to some of the bridges. There are no "trails" or forest roads in this part of Ohio.