You could hide some valuables within your walls. You don't have to cut pieces out of the walls. Many places around your house have areas that are already pre-cut. Perhaps you could deactivate a few unused electrical sockets to use as a place to store stuff.
If you wish to boot your home's security, one cheap way to do this is to buy exterior lights with motion detectors. At night, not only will these lights be handy to light up areas around your home,they are also a cost-effective and efficient security addition. If you position motion detectors properly, it is very hard for someone to sneak onto the property.
If you're in a rural place, you might not be as worried about break-