The jungle island you mentioned was Jungle Larry's Safari Island, and was an island in these waterways accessible to visitors via a floating bridge. It was located roughly where Power Tower is now. It had a wide variety of animals that performed shows throughout the day. These animals spent the summer at Cedar Point and the winter season in Florida.
Based on your descriptions (and pictures) Frontier Trail seems to have a lot in common with Silver Dollar City down in Branson, MO (my favorite park outside of Orlando and SoCal). I think you would get a real kick out of SDC especially since they do not have a Panda Express ruining the theme.
Gene Ellerbrock Kalida, Ohio