Set that camera on bulb and shoot from the balcony at night! Use a bean bag or a small tripod if you have one. Sounds like a great time.Shoot lots of film.
Very nice story about the gentleman and the sunset. I think you will find the Japanses people to be wonderful hosts of their country, especially when you get out the bigger camera. The gardens sound like a place to set up. Not sure about permission and tripods, but just ask and smile. Did you bring any prints along to show? tim