Keep all doors and windows locked.  If the weather is warm and you normally leave your doors open for ventilation, lock the screen door. 

Keep outdoor lighting on at night. 

Keep landscaping trimmed and away from windows and doors to avoid providing a hiding place for the perpetrator.

Report suspicious activity in you neighborhood to police. 

Advertise your security alarm system by placing signs in visible locations. 

Write down license numbers of suspicious vehicles in your neighborhood.

When carrying packages or valuable items, store them in your trunk if possible. If your do leave packages, clothing or other articles in the car, make sure they are out of sight.

Lock all bicycles with a case-hardened chain or cable and lock, winding the cable through the frame and both wheels and then around a fixed object.