A sure way to let folks know you are away from home is to allow newspapers or mail to accumulate on your driveway or in your mailbox. Whether you are going away for just a day, or going on vacation for a week, it is a good practice to place a "hold" on your mail and newspaper delivery while you are gone. Making your home looked "lived in" is a good crime prevention tool. Another option is to ask your house or pet-sitter to remove door hanger advertisements, the paper, and your mail.
The postal service (USPS) offers online notification for mail "hold" requests. Check out their site HERE. Contact your individual newspaper provider for steps to temporarily stop service while you are away.
These are a few simple ideas to help you become less of a target to a thief. Remember to be proactive in crime prevention!