How much is a taxi from Kunming City to Western Hills/Dragon Gate? Are there taxis to come home?

I have no idea of your exact place, so I can only tell you the estimated cab cost can be CNY50-70. Generally, it is not hard to take a taxi back. In case you cannot find one, walk to Gaoyao bus stop from the main entrance and take bus no. 6 to its terminal station. Then take a taxi to your destination.

Oh, for the back way, you can also take the cable car from Dragon Gate down to Haigeng Park, which is not far from downtown. You may choose the public bus or take a taxi then.