Vijayawada: Andhra Pradesh tourism department celebrated the Independence day with patriotic fervour at its head office here on Monday. Speaking on the occasion, K Kanna Babu, chief executive officer of AP Tourism Authority, and managing director of AP Tourism Development Corporation, said tourism is one of the key growth engines of development. “It contributes 10% of the national gross domestic product and 5% of the SGDP. AP is a versatile state which is blessed with ample opportunities…