I would treat it the same way I would treat an upcoming party or the apartment being renovated. Since it's only the one neighbor, I would just put a note in their mailbox where you explain the situation and offer them a way to contact you. If you later see them, ask them if they received (and read) the note, and reiterate that you'd like to be as accommodating as possible.
I wouldn't offer them beer or treats or something like that, since you don't know them. They could not drink beer, be on a diet,... it's tricky to give a gift to someone you don't know. Instead, if you feel strongly about this, you could offer to return the favor for their patience, something neighborly like house sitting, mowing the lawn,...