Make your house "hard". If it looks difficult to enter, is difficult to enter, and is well-maintained, chances are burglars will look somewhere else.
Place sufficient lighting in the front/back of your home and garage.
Use deadbolt locks as secondary locks on all doors. Ensure you have 2 1/2 - 3" screws in the door frame strike plate to reinforce deadbolt security.
Fortify your windows and sliding glass doors with secondary locks or dowels that fit securely in windows. Dowels can be made of wood, PVC pipe or metal. Secondary locks include eye and hook, Charlie bars.
Secure your garage doors with a padlock or a sliding/cane bolt. Lock the door that leads into the house from the garage.
Develop rapport with your neighbors. You are more apt to look out for each others' homes and property if you know each other.
Trim all of your landscaping below windows to avoid concealment areas.
Make sure your address is visible from the street so emergency personnel can quickly respond with ease.
Don't let mail or newspapers pile up. This is a telltale sign that you are gone. Arrange for a friend or neighbor to collect these items in your absence.