As the name implies, Pacific Beach is on the beach between La Jolla and Mission Beach. The clientele you'll find here usually skews on the young side–college age and young professionals. The bars are mostly casual in nature with perhaps the exception of Tower 23's JRDN, where a nice dress wouldn't be too out of place.
Slowly but surely, more gentrified options are opening in the area. For upscale eats in a contemporary dive bar setting, The Duck Dive is a major player on the PB bar scene. Locals love duck fat fries, clean bathrooms and other gourmet eats. Or, check out Crushed, with its trendy ambiance, great value eats and craft beer. However, despite a rejuvenation of sorts, these spots do turn into a nightlife scene after dinner service and can get a bit festive during weekend sports.
In addition to bars, Pacific Beach has casual shopping and, of course, the beach. It's a fun area for those who prefer a youthful atmosphere.