This is very niche information though, we have short cruise service, enjoying night lights around Tokyo area, only available among October to Jun on Saturday and Sunday.
It departs from Yokohama Ohsanbashi, at 18:10, costs 1440yen for adult,720yen for child. you can get there by 7 minuets walk from “nihondai-dohri” station minatomirai line. The ticket is issued without seat, if you need seat for yourself ask them with seat. The price is the same.
In Autumn and Spring time would be much comfortable.