lots of different things factor into it, mainly what it is your career aspirations are....but overall - it's a bad idea.
throughout college you should be building more and more momentum (be it through good grades, internships, relevant work experience, networking) that will help propel you ahead of the pack when it comes to being an attractive candidate for hire.
to basically take whatever momentum you've created and stop it dead in it's tracks by taking a bunch of time off, is most likely not going to help you out when it comes time to getting an actual job.
*coming from someone who has been through the whole college process twice now....about to finish my second degree. just my .02 *