We had someone get in our house the first night that we were there. Very scary because we caught the guy as he was about to enter our infant son's bedroom. 2 minutes later would have been a different story. The robber escaped but he had already looted another house before us and it started our trip on a sour note. The police need to do more to get rid of the drug addicts - we will never go back and I would warn other families to think about safer options for kids vacations.
Although it's never happened to anyone on any of the groups I've traveled with, I have heard stories of folks having their bungalow/house broken into while they were at the beach. In my experience, most places have small in-room safes for securing your valuables. Use them!