Before you tell someone where to go, make sure you’re following these simple steps:
Who are you really writing for? People who are not from here, maybe not even from this country. People who don’t know the shorthand and common names for things. Your visitors will try to match up your directions to maps, to their printed itineraries, and if it’s too tough, you’re just frustrating them.
via Small Biz Survival: Writing better directions for tourists.
One good thing to remember is to make it possible to make the directions mobile friendly. At least make it easy to text the directions to a cell phone.