Visitors who bring specially marked Kraft String Cheese packaging to Six Flags Discovery Kingdom in Vallejo will receive $15 off general admission any day of the week. Six Flags and Kraft have partnered with TerraCycle to collect and recycle the cheese packaging. This is the first time it can be recycled! TerraCycle will make the packaging into eco-friendly plastic products including trash cans, flower pots, plastic plywood, park benches, and picnic tables.