Conversation so far:
Were there any explorers in the Mayan region during the Preclassic Period?
On 30 July 1502, Christopher Columbus arrived at Guanaja, one of the Bay Islands off the coast of Honduras. This was the first recorded contact between Europeans and the Maya
What was a notable event during the Mayan Preclassic Period?
The Maya developed their first civilization in the Preclassic period.
What were the origins of the Mayan culture?
Scholars continue to discuss when this era of Maya civilization began. Maya occupation at Cuello (modern-day Belize) has been carbon dated to around 2600 BC.
Which crops did the Mayans raise during their Preclassic Period?
Settlements were established around 1800 BC in the Soconusco region of the Pacific coast, and the Maya were already cultivating the staple crops of maize, beans, squash, and chili pepper.
When was the Mayan Calendar developed?
The Maya calendrical system, in common with other Mesoamerican calendars, had its origins in the Preclassic period.

Question: What else did they develop during this time?
Self-contained rewrite: What else did the Mayans develop during their Preclassic Period besides their first civilization, the origins of Nayan culture, agriculture, and the Mayan calendar?