In a large microwave-safe bowl, combine cereals and nuts; set aside. In a small microwave-safe bowl, combine the butter, sugar and corn syrup. Microwave, uncovered, on high for 2 minutes, stirring once. Pour over cereal mixture and toss to coat.
Cook cereal mixture, uncovered, on high for 2 minutes, stirring once. Add coconut; cook 2 minutes longer, stirring once. Spread onto waxed paper to cool. Stir in pineapple and chips. Store in an airtight container.