Try doing some volunteer work that is a great way to spend time.
Also, it can lead to a job(the whole networking thing) or will give you skills you can put on a resume.
www.volunteermatch.com is a good place to start looking
also most local help hotlines are in need of volunteers
the cooperative extension service in your area is also a good place -- 4-H agents all over usually always welcome volunteers.
last but not least -- try joining another club on campus not exactly related to your major
You know what they say -- this too shall pass