You can also take the elevator down to B1 and have a breakfast of toast, egg, and coffee for about Y600 at a restaurant called either "Excelsior" or "Exceisior," depending on which sign you read.
I haven't seen PHT promotions lower than about Y48,000 base rate. There are lower corporate rates, and there are rooms less expensive than a Park room (although not many of them). If you get the less expensive room, management recommended to me that you pick a twin over a king, if possible.
Seems to me that the REAL treat would be to pay rack rate and use points to upgrade to a suite! Best 6,000 points you'll ever spend.