Pacific Beach, San Diego
Everyone who goes to pb goes to Moondoggies, PB bar and grill,etc. But one overlooked gem is the Australian pub. It too can get a little meatmarkety (hell, the Safeway on garnett gets a little meatmarkety), especially on weekend nights, but it's a great place to have a couple of pints and listen to some music if you're not in the mood for full-on clubbing.
Dress Code: I don't think they have one.
There are dance clubs all over and even downtown. Those are more of the ritzy type, so if you really wantto have fun and hang out with the college crowd, go to "PB" Pacific Beach.
On that block, there is at 10 clubs and bars, ranging in all fifferent types of music. At the end of the block is a Denny's to sober up, or you could always go for a midnight stroll on the beach.
The best time to stert showing up to the clubs is around 21:00 and the clubs close by 2:30 since alcohol cannot be served after 2:00 AM.
Dress Code: Informal dress, but guys should wear pants and some kind of shirt.
The ladies get away with wearing whatever cute outfit they like.
Pacific Beach in San Diego, CA has many decent bars and a college student and beach life favor. The crowd varies slightly based on the bar. For example, PB Bar and Grill is mostly college students, though there is a mix of people. PB is, for the most part, a singles and college scene. There are more family friendly beaches in town, notably Coronado.
Dress Code: Whatever. Shorts and flip-flops, if the weather is okay. It can get a little chilly during the winter . . . light jacket chilly.