Michigan Adventure Activities By martkia1 May 4, 1956 Michigan Adventure Opened Jul 5, 1989 Magnum XL-200 New Mar 12, 1991 Wild Water Rides Opened Feb 22, 1997 Michigan Adventure Added Snake Pit Slide Aug 17, 2005 Funnel of Fear Tornado Slide Was Added Nov 3, 2011 Beach Party Opened