First of all, thanks for this (and many others!) interesting post.
I find this part of the park during this era fascinating. I even have purchased old GAF viewmaster reels showing this part of the park. I just can't believe that something like that was really at Kings Island.
On a side note, my parents took me to Kings Island when I was 2 in 1975 (and we rode the monorail), and I, of course, have no recollection of it. However, I always remember having dreams about a beautiful, grassy place as a kid, but I never could figure out what I was dreaming about. Fast forward to the early '90's when I made it back to KI for the first time since that first trip. I remember having this very strange feeling of deja vu. After looking at old pictures of the park, I think my dreams were of that first Kings Island trip. I think this is what has made me so interested in Kings Island as an adult. To this day when I walk around the park, I get this feeling-can't say it's happy, or excited, or what-but the only place I get it is at Kings Island. I've heard people say that we have an "inner child", and it's like somewhere deep in my brain, it "remembers" those old parts of the park that I saw as a really young child.