Good stuff...DO ONE!
Be sure to pick a place that you would wanna work and that will still be around. The experience will be good anywhere you go but the foot-in-the-door is well worth it.
Search hard too cause there are paid ones as well.
I did UPS which is one year, paid (well paid) and great experience. Coca-cola has one coming up, SWA has one, FedEx may...many regionals have unpaid internships...
Lots is out there...make calls, search other schools webpages and find the best one for you.
Good luck!