If it is just a temporary thing, you don't have to do anything. You can just notify people (if you want to) letting them know you won't be around for a while so that they don't worry about you, and then leave it at that.
If you don't plan on returning again, ever, then you can delete your page. But I would only do that if I knew for sure that I was not coming back ever.
at 2:57 PM on Feb. 24, 2009