How did you explain..

How did you or do you plan on explaining to family members that you wouldn't like unplanned visits after the baby is born? I don't mind visitors, but I would hateeeee it if people showed up unannounced. This will be my husband and I's first child, so I know that it's going to be all new and stressful and I don't really want that many visitors once we are home for a week or so. I just want it to be said nicely...