We found a wonderful park (Aune-Osborn Campground) to sit and watch the freighters go up and down the St. Marys River. It is the lot for the picnic area/boat ramp. https://youtu.be/IlyJcig02rw
The Soo Locks Visitor Center is a nice place to view the locks. You can watch freighters go through the locks. It’s like watching snails race on a large scale. The information in the visitor center is well done and explains how the locks work and how they were built. We had a special treat to see an historic freighter that served in WWII pass through the locks. The Lee A. Tregurtha (original name USS Chiwawa) was and oil tanker built for the US Navy in 1942. It is now hauling taconite.
Across the street from the visitor center is the Lockview Restaurant where I had whitefish and eggs for breakfast. This dish tasted much better than it sounded. It was great. Jen had smoked whitefish on a bagel that was also great. A lady in the Visitor center recommended the whitefish there. So we went.