Thank you,
The _Banking_Scot , that's very helpful. I had started looking at Hilton properties because I have the option of using more points for an executive room, which I like - I wish IHG had that choice.
Three of those properties - Prince Sakura, Hilton Odaiba and Hyatt Regency - aren't available for my dates. The Conrad is more points than I have to spend but I am seriously considering the Hilton Shinjuku, which is available and I can book an executive room with points. I was considering the Westin but this seems to be a better location.
Appreciate your comment about the shuttle service, good to know it's an option but not required.