Six Flags Says "Cheese!" Visitors get $15 off general admission at Six Flags St. Louis when they bring specially marked Kraft string cheese packaging to the park entrance. Kraft Cheese and TerraCycle, Inc. have partnered with Six Flags for a summer recycling drive at Six Flags parks across the United States. The packaging will be sent to TerraCycle to be recycled into eco-friendly products, including trash cans, flower pots, plastic plywood, park benches and picnic tables.