I'm going to Tokyo for honeymoon too next month, but we go free & easy instead of follow tour. These are the things that I'll bring:
1) my wife (most important, )
3) Nikon 12-24mm f4
4) Nikon 50mm f1.4G
5) 0.9kg eye-level tripod (for taking picture together with wife instead of asking stranger to take for us - they may run away with my camera )
6) Nikon remote control (good for taking picture together with wife without timer constraint)
I think I may need to bring another prime lens - Nikon 35mm f1.8G. What do you think?