We have lived on the mainland belize for 7 years now and love it. As this was a British colony, they have retained most of Britians gun laws. Guns are expensive and permits are required for everything even the bullets. But as inmost of the rest of the world the criminals have no problems getting and using them. Crime is rampant in Belize City, but the rest of the country is relatively quiet crime wise.
We moved here primarily for our kids. Kids are everywhere, very friendly, and open. As are most Belizeans, it is a great culture and we love it. There are certain drawbacks culturally, such as lack of availability of common things, telephone and internet works when and if it feels like it, etc.
You would really need to come and stay for 6 months or so before moving here to make the decision for yourself. Some love it here and some hate it. Just my .02