The Tokyo National Museum, which has always been cool, was a complete bust. There was no special exhibition while we were there, the awesome tea gardens were closed, and 75% of the permanent collection was closed. It was in this museum that I first found my favorite Japanese ice-cream treat: Coolish.
A second story hot-dog shop in Akihabara with a traditional Japanese Christmas Lump.
At about 4" high, taking up about 1/4 of the entire restaurant, the Christmas Lump was actually closer to our table than I.