The casino first opened its doors to the public in 1992 after years of planning and development. 7.5 What is the busiest time of year for Mystic Lake Casino in terms of visitors?Īs we delve into the history of this popular establishment, it becomes clear that Mystic Lake Casino has a rich and fascinating past.7.4 Are there any non-gambling activities offered at Mystic Lake Casino?.7.3 Is there a hotel at Mystic Lake Casino?.7.2 How many slot machines are there at Mystic Lake Casino?.7.1 What is the legal gambling age at Mystic Lake Casino?.5 Community Involvement and Philanthropy.4 Economic Impact of Mystic Lake Casino.2 The Shakopee Mdewakanton Sioux Community.