Osaka Castle, not far from Kansai International Airport. You can arrive at the castle in one hour by expressway. The castle opens early at 9:00 am. When you visit the castle in the morning, you will have enough time for the Osaka City sightseeing in the afternoon. It is easy for planning. And Osaka is close to Kyoto and Nara, and gives you good access to the cities.
■Route from Kansai International Airport to Osaka Castle By train