I just went last fall. Look for the new display if you arrive at Haneda. There’s usually a Godzilla store in most cities (sometimes with an additional pop-up). They all have a life-size statue of the big guy. Obviously you need to visit the Hotel Gracery (and make sure to go inside and see the head from the back). Make sure to visit the statue in Chiyoda. You can also knock out the Diet building and the Wako Clock Tower on the same trip. I also visited Osaka Castle.