For a premimum of $80 per night, the Park 360 package is a steal!
I have stayed at this property many times and can tell you that you will likely save a lot of money with the package.
The incidental charges for things like breakfast, access to club on the park (which is the luxurious spa area within the fitness area- normally costs over 4,000 yen per person per day for entrance)
The value of the package benefits, if you were to those things on an "a la carte" basis, would probably be AT LEAST $200 a day for two people, and that is a conservative estimate.
Also don`t dismiss the "deli gift"- from my many experiences it is probably a beautiful $30 box of delicious chocolates, or something.
If you can have the airport transfer for your way back to NRT (don`T see why not)... that would save at least $300 to $500 for the car service, no joke.
As Peter Pointed out- even the bus will cost $70 or so for two people.