Biloxi, MS Phone: Description: This casino overlooks the Gulf of Mexico and the Biloxi Back Bay.new years eve party at mt pleasant casino michigan HOLLYWOOD HOTEL AND CASINO TUNICA This allows the riverboats to offer hour dockside gambling. Mississippi, the casino will deduct 3% of your winnings and pay it to the Mississippi Tax Commission as a gambling tax. msejenkins > Riverboats of America > Mississippi Queen Riverboat Casino. Share. A riverboat casino is a type of casino on a riverboat found in several states in the United States with frontage on the Mississippi River and its tributaries, or along the Gulf Coast. Several states authorized this type of casino in order to enable gaming but limit the areas where casinos could be constructed.