Trimmed hedges- be sure yours are kept up. When trimmed, an assailant can't lurk behind in wait. Photo cell or timed security lights around drive and entrances. There are also the motion detector types although these can be irritating for those with outside pets. Dogs-Any dog is distasteful to a burglar.
Large dogs are, a great deterrent, small yappy ones work well for an alarm.
If you have the old fashioned wooden windows, a simple step can make a world of difference in the security o the house. Use a small drill bit, and drill holes for nails to fit in. These holes must go through the first part of the window and into the one behind. These are placed at the top corner of the section that will lift. They can fit flush with window and are hard to locate unless you know they are there.