I worked for the union all of last year. It is only minimum wage, but very friendly
Plus, providing you work tuesday/firday they're very flexible on shifts and hours, allowing you to vary them in accordance with you work load. Just walk in and ask for a form (but the earlier the better)
For other places, the best bet is to simply C.V spam, give one to every bar in town. Often they don't advetise, but simply look at the CVS they already have. That got me my current job at one of the hotels. However they tend to be less flexible with hours and often don't pay much above minimum wage either. But amercians tip better than students! If you have no experience and only wish to work part time, theirs not too much work going. Waiters/Waiteresses seem to be more indemand, especially at some of the hotels. The best bet is to say on your CV you'd happily do both.