There is too much to do at the Expo park. Three hours is not enough. So many beautiful plants, education and cultural activities and a stunning aquarium.
Before going to the Louvre I highly suggest making a list of the art you really want to see and where it is in the museum because it's easy to get lost and turned around.
When I was telling my friends of my plans I included that I had a free day in Osaka before the rest of my group met me. I planned to check into the hotel, or at least dump my stuff off in the lobby then grab lunch and maybe just relax and do something near [...]