I visited Osaka along with other Japanese cities in October 2013. The biggest thing that caught my attention here was the extensive street shopping district in the middle of town known as Namba — literally the lighted and buzzing streets stretch out as far as the eye can see! (click on any photos to enlarge in full size).
On arrival into the city and airport area
Central shopping area “Namba” at night with lots of foot traffic, crazy signage and lights!
The main business district (downtown) with a nice river going through it and plenty of food stalls
The historic Osaka Castle with its surrounding moats and parks