You can't do what you're trying to do by importing a .kmz. It would be great, but the .kmz camera angle is based on Google Earth's Lat/Long information and camera angle, which doesn't translate in SketchUp.
What you can do, is to create a "Scene" with the same camera angle, but you'd have to line it up manually, and then save the "Scene". You can then make numerous Scenes and have the SketchUp file play through the Scenes similar to a Tour in Google Earth. You control/edit the Scenes using the Scene Manager in SketchUp.
You may have to alter the camera's Field Of View in SketchUp to more closely represent what you see in Google Earth.
Does this make sense?
- CraigD
Here's how you create a Scene: View menu > Animation > Create a Scene.