There is no such place as Port San Juan City. However, there is a city known as San Juan located in Puerto Rico. San Juan is the capital and largest city of Puerto Rico. It is situated on the northeastern coast of the island and is a major port and tourist destination. The city is known for its historic Old San Juan district, which features colorful colonial buildings, cobblestone streets, and fortifications. San Juan is also home to beautiful beaches, vibrant nightlife, and various cultural attractions.