I think you pretty much stuck, nuttn much but a few casinos and a bunch of desert.
After HS when I moved to Phx to goto ASU (go devils!) we (me & a freind) kinda took a small detour and went to Vegas. It added quite a bit to our drive but it was way fun.
I think your only stop might be somthing like blyth?
I dunno, I don't really go mutch to AZ any more... to hot