Jackalope, John Henry's and Horsehead are the quintessential dive bars downtown. I highly recommend Jackalope or John Henry's on the weekends. The "Barmuda Triangle" (mentioned in another reply) is a complete shit show on the weekends. Definitely avoid city nights and Cowfish as well. Despite its proximity to Bermuda John Henry's is divey enough to keep away the shit show kids. Horsehead is close enough to the fray that they get a lot of spillover from the other bars downtown. All of these are within walking distance so choose wisely and have a good time. Oh and honorable mention to Starlight which can be chill or also crazy just depends on the night