For next year Mother's Day or GW or Whatever....
Tokyo Bay Cruise is little known but once again a very good getaway :-)
I know I have posted about "Cruise lunch" before, but I just took my mother and sister on Mother's day to one and once again (this time the ship is bigger than the last one) it was a blast. My mother loved it and I am sure you will love it, too.
These cruise lunch or dinner can be used for many types of occasions - for weekend lunch or dinner for date, we used this for the early morning solar eclipse observation, and although expensive, can be used for watching Tokyo Bay Fireworks (would love to try one day - if and when I can afford it :-)).
The info of two big players are here:
Hope this helps!