The extensive grounds of Osaka Castle were impressive. The next night, friends took us to the top of a 7-story building with a rooftop entrance to a huge, red ferris wheel. High over the city's brightly lit, colorful streets, we saw tsuki (the moon) and Osaka Castle aglow with green lights.
Fondest memory: As in other cities during our trip, we were fascinated by the combination of ancient and modern. I took this photo of the castle wall moat.
Favorite thing: Visit OSAKA-JO CASTLE: The interior of the castle houses an excellent collection of Toyotomi Hideyoshi memorabilia and displays relating the history of the castle. Go right up to the top floor (I think ... 8th floor) and it provides a bird's eye view of the entire city!
I was in Osaka just for one day, coming from Kyoto on a day-trip, so I visited only the Osaka-Jo and the Umeda Sky Bulding and I recommend not to miss them.
Fondest memory: Like any other japanese city Osaka is very busy, some guide books say that it is the busyest one.