Install alarm system
Install Camera. (A fake one will work, but real is much MUCH better)
Post camera /alarm signs everywhere..
Tell everyone about it and show it off.. If the camera is real, show them than too..
Here's a little story for you...
I have a camera looking out my front yard.. I've had the camera for 10 years or more.. All my neighbors know about it and even make funny faces sometimes just to goof off.. A few years ago, some kids decided it would be funny to soap everyones cars and toss some toilet paper around.. Nothing serious but they skipped my home!
I even caught one of my neighbors turning my camera slightly so it would cover part of his home too... LOL.. (a good neighbor trying to give me a hint)