Thanks @baris it might be useful to add to the acp at the category editing page...
Hide Category from Administrators group
I have a category called "Isle of no Man" on my forum, which is basically a forum for my wife and her friends to have girl talk. I shouldn't have access to it. As far as I can tell, there is no way for me to hide it from myself, but I wanted to make sure that was the case before putting in a feature request.