Fiestas patronales (patron saint festivals) are held in the central plaza every year.

These Spanish regulations also stated that the streets nearby should be comfortable portals for passersby, protecting them from the elements: sun and rain.

[7] Located across the central plaza in Guaynabo barrio-pueblo is the Parroquia San Pedro Mártir, a Roman Catholic church.

In 1899, the United States Department of War conducted a census of Puerto Rico finding that the population of Guaynabo Pueblo was 465.

[16] In July 2020, Federal Emergency Management Agency appropriated funds for repairs to Guaynabo's plaza.