Many recruiters look to see what you did beside take 15 hours of class per semester. Part time employment is one way to do that. If you don't want to or can't work, there are other things you can do. By getting involved with campus organizations, you show dedication to something other than yourself. It also gives you the opportunity to network with more people.
Some organizations work with companies in the community or host community activities.
These activities give you a chance to introduce yourself to people and make a name for yourself. Another way to be involved is by volunteering. There is always some group or organization trying to find volunteers on campus. The most important thing you can do as a student is to get good grades. One of the first things recruiters look at is your grades.