I was just playing around on google maps. It's amazing. I searched for the shinjuku hilton. Then I zoomed in until I saw these pink areas on the map. I believe these are underground passages that connect subway stations to various buildings in the area. The Google map also shows exit labels such as B5 or N6. Assuming that I can locate the signs directing me to these exits, I would have a relatively easy time finding my way to the hotel.

I am planning on staying at the shinjuku hilton. There are multiple page threads directing others how to negotiate these passageways. Now that I have this Google map Rescource I have a visual to go with the directions.

I hope this helps the OP. I have not been to Tokyo, but I am confident of the accuracy of these maps.