Most of this information comes from a lecture during Ancient World Week, 2017, by Dr. Cynthia Robin of Northwestern University, who is currently the archaeologist in charge of the excavation of Aventura.
This site was in the Late Preclassic Heyday, from about 350 BCE (B.C.) until about 250 CE (A.D.). It is east of Corozal Town.
Aventura flourished from the Terminal Classic, about 750 CE, to the Early Postclassic Heyday, about 1100 CE.
This site, actually in present day Corozal Town, was most active in the Late Postclassic Heyday, from about 1300 CE until after the Spanish arrived, in 1511.