Think About Your Most Valuable Things
Some things are valuable monetarily, and some things are emotionally valuable. Either way, you should categorize your items and be sure to put them away in a safe location if you have travel plans. This could be something as simple as an item passed down from your great-great-grandmother, who lived over 100 years ago.
Thieves are clever and good at picking up on these kinds of things. They rarely overlook them, leaving you to remain sad about something you could have protected in the first place. Your valuables should be just that, yours, and not someone who unjustly stole them from you.