Job Search : What if I’m not ready to look for a job?

Go to learn more about jobs. Employers are impressed when freshmen and sophomores introduce themselves at career fairs. Part of the point is to learn more about what employers have to offer. Fairs are rare opportunities to talk with lots of people and learn about jobs straight from the source.
You still need to do some research (see before you go, above) and have good interpersonal skills (see at the job fair, above). The difference is that your goal is to get career information, not get a job (yet).