What to do when you go on holiday?

[wallcat]

I've heard that it's a good idea to keep a regular schedule when it comes to keeping your website/blog updated, but there are times in life when it just isn't possible. If I'm going on holiday or family related responsibilities come up it can throw off that schedule. If you're the only one maintaining a website, what do you do if you have to leave it for a while? Do you set up scheduled posts to update while you're away or inform your visitors that there won't be an update for a while?