I got my first hospital job as a result of a job fair. At the time, I was a LPN. When the recruiter told me they were concentrating on hiring RNs, I asked her who was the person to talk to for info on trauma nursing. She pointed out a manager, and I promptly walked right up to her, shook her hand, and introduced myself to her. I said I knew I was a LPN, and she wanted RNs, but that I was extremely interested in working in trauma, and that I would work my tail off to prove myself as a nurse. I got hired that week.
I went in there expecting not to get hired, but determined to pitch myself and learn something in the process. Job fairs are great, because you can focus more attention on what that facility has to offer you as well, so you can compare. It's easier to ask questions re; pay, ratios, etc. than when you're in the middle of a job interview