Be vigilant in Belize City
where gang related crime can be an issue. But the city’s tourist areas are very well policed. Always carry ID, and make copies that you can keep separately at your hotel. In general, most people don’t wander around at night. Get a cab rather than walk at night. The rest of the country is very safe in this respect.
Check safety procedures with any adventure or activity companies
and, in particular, with water activities, making sure there is a good instructor to tourist ratio, and that there are life jackets of helmets, in the case of white water, and that they fit children too.
Check the FCO website
for safety information and entry requirements.