Make good freinds with your neigbors.If I see someone snoopin around my neighbors house when their not around,I ask"wassup brah? you lookin for somebody?"
I think the bestsecurity is having a big ass family.we get chokest people at our house,Anybody even think about trying to rob us is gonna be in for a big suprise.

Some added things you can do,Go to the thrift store and buy some big dirty construction boots and leave um outside your door.People coming up to your house will see and be like "must have some big dude in there."
Here in hawaii its custom to take your shoes off before entering your house,so you can kinda judge whose home by looking outside the door at how many shoes/slippahs are out there.
My freind get automatic timer on his tv and stereo,he set um for when he goes.So at least there is noise coming from the house,if you get automatic timers for your lights too.