High Quality Content by WIKIPEDIA articles! Pacific Beach is a neighborhood of San Diego, bounded by La Jolla to the north, Mission Beach and Mission Bay to the south, Interstate 5 to the east and the Pacific Ocean to the west. While largely populated by young people, surfers, and college students, the population is becoming older, more professional, and more affluent due to rising property and rental costs. "P.B.," as it is known as by local residents, is home to one of San Diego`s larger nightlife scenes, with dozens of bars, eateries, and clothing stores.