This was SO LONG AGO (1990) and it was all planned & navigated by by colleague Pat that I don't exactly recall the name of it, but it was in Canada and had to be in driving distance from Michigan where we were at the time, and so looking online I found one possible matching location called the Niagara Escarpment Rattlesnake Point. Looking at some of the images online it is a good possibility that this is where we were.