Does anyone know where I can find an accurate polygon database of all golf courses in the us?
8852 golf courses in USA http://geodeg.com/search.php?q=golf+course&language=&country=220
I don't think every data dream can come to reality.
If there's an agency which does not have a vision to manage geo-spatial information for itself, getting such a data can be a tedious task.
You can get the textual information very easily, but finding a GIS data can be (almost) impossible.
See the Golf Directory...