Import KML/KMZ files into Civil3D
If you need to import a KML/KMZ file into Civil 3D or Map 3D, you can do it using a free download from SL-King Spatial Solutions. Be sure to read the readme file because the install does require you to copy some files and edit an existing file.
We have tested it using Civil 3D 2013 64-bit and it works just fine. If you want to read some more information on it, take a look at this thread in the Civil 3D forums.