Hello fellow FTers. Have decided to pop the big question to my GF

Won't be a total surprise, since we chose the ring together, but would still like to do something special. Thought about going back to the Institut Franco-Japonais in Iidabashi where we first met for the sentimental value. They do have a small brasserie there and a garden, but would be interested in any other ideas. Any very romantic restaurants/locations/events in or near Tokyo? The alternative would be to wait to go back to Paris and propose near the Eifel tower, but that would be too ordinary, no?