Recent break in duplex-what security measures are people using?

[Jennifer White]

Brand new landlord here.  We just closed on our first duplex in December where one unit is currently rented out and the other is vacant.  I just received a call from our tenant that she had a break in.  This is the second time it has happened since she started renting back in September but obviously last time it was under the previous owners.  Both times we think it has been teenagers as last time a tv was stolen and this time only her children's video game consoles and games were stolen even though she had other valuables laying around.  The duplex backs up to some woods and on the other side is a school.  The area is probably a C-class area.  From the front, the duplex is very visible and seen by many but unfortunately because of it backing up to the woods is less secure.  I'm considering some options to improve the tenants security as I feel awful that it has happened twice now.

1. Motion detector lights in the back-even though I think both break ins have been during the day.

2.  Cameras for the back? I figure this might be helpful or even fake cameras might deter someone?

3.  I considered bars on the back and side windows to prevent any intruders.  What do people think of this?  Unfortunately I know it probably doesn't look the best and when we try to rent out the other side might hinder people.

4.  Improving the locks on the windows?  

Any other ideas?  Just wanting to nip this in the bud if possible.  I know there will always be crappy people out there but want to do our best as landlords for our tenants security.

Thanks in advance