SE corner of Adams and Viaduct Roads. Take M-115 to Harlan. Take a right (north) on Harlan until Faylor Road. Left on Faylor Road to Viaduct Road. Right on Viaduct Road to Adams Road. Take a right; entrance (if you can call it that) is about a third of the way down Adams Road.

Check out this map of Hoot Owl Manor itself, based on my faulty memory: Map