When we hear about the use of chocolate by the natives of what is now mexico and central america, we hear the drank it ritually in is raw bitter form. Did the aztecs, mayan or other civilizations have or make sweeteners like honey, sucrose and such? What about spices? Were they commonplace?
For the Aztecs and Mayans, they definitely had some sweeteners and spices in their cuisines.
The Aztecs usually used honey to make sweet treats eaten during their festival during the winter solstice, which later synced with posadas in Mexico, being associated with Christmas and Jesus now. The treat was called tzoalli from Nahuatl, being made of honey (or maguey nectar) and amaranth seeds that were shaped as figures portraying deities. They are called alegrías in Mexico and retain most of the same ingredients today. There's also vanilla, or tlilxochitl in Nahuatl (literally meaning "black flower") that is naturally sweet for consumption for their cold 'hot' chocolate drinks. Additionally, they potentially could have used an herb called Aztec sweet herb (Lippia Dulcis) or tzopelic xihuitl (literally meaning "sweet herb/plant"). Though, it is still being discussed if they ever did use it to sweeten food and drinks.
We have obtained no evidence, either from the literature or from field inquiries, that L. dulcis has ever been used for sweetening foods or beverages.
The Mayans have been known to also use honey more since they had a domesticated Mayan honeybee that was stingless, but bit when provoked instead. Balche is a traditional fermented drink that contains some alcoholic content, losing some but not all of its sweetness. Vanilla can be used as a sweet spice for their chocolate drinks they usually preferred hot.
Spices that were commonly used by the Aztecs and other neighboring civilizations were: epazote, achiote (annatto), vanilla, hoja santa (sacred leaf), allspice, culantro (not to be confused with cilantro), Mexican oregano (Lippia graveolens, not origanum vulgare), salt, peppers/chilis like paprika and any more that are uncommon to know about. Most, if not all accessible spices and herbs were sold at marketplaces.
If you are interested in learning about more about spices and herbs and their uses by these civilizations, you can search and read about Libellus de Medicinalibus Indorum Herbis or more preferably one that isn't in Latin, such as 'An Aztec herbal: The Classic Codex of 1552' by Martín de la Cruz.