This is now called Black's Cliff Resort and is on Lower Kaubashine Lake in Hazelhurst, Wi.
The Blacks (Maynard) purchased the place from the owners of Keith's Key. The Blacks' granddaughter (Jenny Gibson) and her husband now manage it.
You can check out their web site and blog if you want to see pictures and get a sense for the place now.
Main web site: http://www.blackscliff.com/
Click Blog at the top of the page to check out what is currently happening. There is also a nice History book now that you can check out. It even references Keith's Key.