Which district is primarily associated with the summer resort history of Manila?

The district primarily associated with the summer resort history of Manila is Malate, which has historically been known for its beach resorts and leisure destinations. During the American colonial period, Malate became a popular area for affluent families and tourists looking to escape the heat of the city. Its proximity to Manila Bay made it an ideal spot for resorts, contributing to its reputation as a summer retreat.

Additionally, Malate's vibrant nightlife and cultural activities have reinforced its status as a destination for leisure. The area's historic architecture, along with the scenic views of the bay, adds to its allure, making it a long-standing favorite for those seeking recreation and relaxation.

While the other districts mentioned, such as Paco, Sampaloc, and Sta. Cruz, have their own unique histories and contributions to the fabric of Manila, they do not carry the same significance in relation to summer resorts and leisure activities as Malate does.