Install an alarm system.
Ensure your landscaping provides a clear view around your home.
Install motion detector lights on the outside of your home.
Use timers for interior and exterior lighting.
Use maximum security deadbolts on all perimeter doors.
Inform neighbors when you are leaving the house for extended durations.
Install window locks.
Install sliding glass door locks.
If you go on vacation, have your mail and newspaper delivery stopped.
Lock your car, even in your driveway.
Lock your garage, even if it is a detached garage.
Install security cameras if possible.