The cache is just off the Hancock-Lake Linden ATV trail, near the Quincy Smelting Works.
Heading East from the lift bridge, the ATV trail provides a nice walk or bike ride along the canal and takes you past the historical Quincy Smelting Works site. I have always enjoyed the mix of natural landscape and industrial ruins on this section of the trail, and it seemed like a good location for some fun and easy caches.
You will be looking for a micro stuck in a small keychain.