Well it depends on who the visitors are...if it is my own visitor, like my mother staying, I would just do the very basic daily chores but no major tasks.
When she last stayed, she loved to sit on the couch and watch TV, like a PP's mum...so I wouldn't want to rush around her lifting up cushions and vacuuming lol... Actually I find it hard to be in my normal routine with guests in the house, I am inclined to vegetate a bit....so much so that my mother got the impression that I don't do enough housework! However as soon as she left I was running around doing things again of course.
We are having a friend of my teenage daughter stay in January, a teenager who is coming out from the States to stay with us for two weeks. As she is not here to see ME specifically, I expect I will just keep cleaning as normally as possible, although I will have less time as we will be taking her out to see all the Sydney sights while she is here.