Carnival Checklist: 8 Things You Must Do At Belize’s September Celebrations 1 2 3 4 5 6 7 8 8 September 9, 2013 4. Visit a Mayan ruin There are Mayan ruins all over the country of Belize and all are spectacular. Altun Ha is within an hour’s drive of Belize City so I recommend going there for a few hours to walk off that hangover.