About the cache:
Cache is a small tupperware-style container.
About the location:
This cache is along the Grand Valley Trail. As you walk along the trail (from the waypoint) you'll note the ditch on your left. What you are actually seeing is a historic transportation route! This was a canal in an important series of locks, dams and canals that allowed people to travel up the Grand River. At the GZ, where a creek meets the river, was actually the historic location of the lock.
You can learn more about the Grand River's locks & dams in York where there is a neat map erected by the York Grand River Historical Society.
An interesting sidenote while at the GZ: From this picture (you are where the creek goes under the road) you can see you are standing in what would have been the town of Indiana! The area just across the road would have been crisscrossed with streets like Winniette and Canboro which no longer exist (although some might have been taken into private driveways).
About The Song:
Part of Your World is from the Disney movie A Little Mermaid. When releasing a "Diamond Edition" of the movie in October 2013 they contacted Carly Rae to do a cover of the song. The cover is great and it got its own music video.