There was a small zoo on either Boblo or Belle Isle, as I remember? The giant slide was memorable too. Oh, and the pleasure boaters mooning the Boblo ferry...
While living in Detroit in the early 1980s we would ride down to the RenCen are for festivals, parades and such. More than once coming back at night, rocks and bricks would hit the windows of the bus windows. It felt like Escape From New York.They were all thick plastic for a reason. Don't remember many stories of the riots from relatives who still live there for some reason.