In my opinion Ambergris Caye is quite safe, especially considering that a resort island like this is a magnet for any bad guys from the mainland or elsewhere in the region looking for an easy way to raise some cash for crack or whatever.
Having said that, I'd recommend avoid walking in unlit beach or other dark areas at night.
Don't be lulled into thinking that-n'er do-wells are on vacation here, too -- they're not.
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