Youngest and I visited Arcadia Mill today. It is the site of an old sawmill and textile mill. There is an easy nature trail that is all boardwalk and takes about 15 minutes to complete.
For the more adventurous, there is a ground trail that includes a suspension bridge over a creek, numerous tree roots to use as steps or to trip over, which ever you prefer and some steep boardwalk areas.
Needless to say I was sweating when we got done. And, yes, I did trip over the tree roots.