Dear ________,
You are such a sweet neighbor and friend. I really appreciate the fact that while we were away you kept an eye on our home, bringing in our trash and recycling containers, picking up our mail, and turning on our sprinklers. And you made sure no white moving vans pulled into our driveway! Your kindness allowed us to really relax on our vacation and not worry about the safety of our home and its contents.
(YOUR NAME HERE)