Just take the damn guides.
Me: Would you like a map or a visitor's guide?
Guest: Oh do you have one?
(Or "If you have one that would be great.")
Me: Would you like a map or visitor's guide?
Guest: Hmm maybe, I don't know, is it the same one we already have? (How the F would I know what you already have?) George, do you want a map and guide? (doesn't let George answer) Yeah, lets take one. (puts map and guide on counter} Oh we already have this guide. GEORGE! Isn't this the guide we have?!
Me: Would you like a map or visitor's guide?
Guest: Nah, that's OK, we've been here lots of times before.
Guest: You know what, its been a few years since we've been here, maybe we'll just take a map.