Depending on what you're looking for, there's plenty of bars and night clubs of all types, from Pioneer Square to Bell Town to Fremont and Ballard. I personally don't like the big city type bars, the exceptions are the Elysian (excellent local brew), Hawk's Nest and the Pyramid Brewery during Sounders/Seahawks/Mariners games. I find the smaller bars and pubs outside of Seattle to have a much better beer selection without the hassel of going downtown, paying for parking, etc...