They do have WiFi available, but do not want you to utilize it. I believe they should have mentioned that they would not allow "internet phones" to be used and that you had to limit your computer time.
We vacationed in Montana, Wyoming and Idaho for 2 months during summer of 2007. By far, this was the nicest, cleanest and friendliness of the many campsites we stayed at. If we were to visit the West again, we would stay at Southside.