Hakodate has a famous night view. According to the local people there it ranks in the top 3 list of best night view in the world along with Hong Kong, Milan, etc. Not sure about that, but definitely a spot to visit.
You can take the rope way up to the mountain, and it is open until 10:00PM. When I got to the top, I was surprised to see many chinese speaking folks. I guess business is good in their country. Going to Hakodate from Tokyo is already pricey, imagine all the effort they had to put into make it out of the country and afford a pretty expensive sea food in Hokkaido.
Well, I did my best to capture the night view from so I hope you like it.