Inventions and Arts and Buildings
The invention for the Mayans is calendar and mathematics. The Incas is record keeping and made medical advances. Aztecs was chocolate drink and mandatory education. It was important because that's what they believed in.
Mayans art and buildings are Pottery and sculptures. Incas was made statue of lamas. Aztecs arts and buildings was Jewelry set, stone sculptures, and precious stones.
The Mayans traditions was to play the ball game. The Incas tradition was to farm. The Aztecs was to have a traditional market day.