May I suggest that all international Marriott properties post a hotel location map in the local language on their website alongside their English version?
Many other hotels are doing this now and it would really help to simply hand the map to the taxi driver in a new city. This would be particularly helpful in China, Japan and other places that do not use English characters.
Currently, I call the hotel directly and have them email me a scanned copy of thier local language map. They are always very helpful but posting on their Internet site would be more convenient.