Inui-dori(/Inui Avenue) in the Imperial Palace was opened to public and accepted casual visitors Dec.3-7 in celebration of the 80th birthday of the current Emperor. (http://www.kunaicho.go.jp/eindex.html) (http://www.kunaicho.go.jp/event/inui.html)
Inui-dori is an about 650-meter-long avenue between the Inui gate on the side of Kitanomaru Park and the office building of the Imperal Household Agency, lined by 59 Japanese maples and trident maples. The above 5 days were thought to be the best time to enjoy viewing the autumnal foliages there. Actually, 54,000 people visited there on only the first day, which led to the earlier opening time of 9:30(originally planned to open at 10:00). And 349,500 people visited and enjoyed strolling and floliage- viewing there on the five days in total.