Happy New Year, Sean! We really are Tesla geeks watching TMC while everybody else watching Kohaku TV or went to countdown party!
I asked before, and the attendant said it's free if you stay in the car, they'll charge if you leave. I sent a small complaint to Tesla because it doesn't make sense. If GH chargeso parking fees, Tesla could place Superchargers in P2 rather than Grand Hyatt, so local shoppers won't pay parking fees or pay at much lower rate. After all GH IMHO does not cater to Japanese resident long distance car travelers - it is more to foreign executives? If I lived in somewhere else, I would stay at Park Hyatt, Conrad, Ritz or Peninsula/Shangri-la - they have much nicer view and better spa facilities. Sorry for out of topic talk.
So I may try Grand Hyatt SC tomorrow or two days later and will see again (1) slow charging rate and (2) parking fees.
And thanks for the offer. Will let you know when I'll be there.