Pros
Years later, I still think about my internship with the Clippers. First, it's a "rotating" internship, so you'll be exposed to sales, marketing, events, ballpark operations, etc. all in one summer. You also get exposed to a ton of cool, behind-the-scenes stuff which is great as a sports fan. The entire front office staff is truly amazing. They genuinely care about the interns and are beyond willing to help you learn & grow throughout your internship. The training process is intense... basically, a packet of info that you'll randomly be quizzed on... but SO worth it, as it really prepares you for a season full of questions from customers. I've yet to have a training process develop me into a confident (and competent!) employee as well as with the Clippers.
Cons
Lots of hours (look at the schedule before applying to see if it's right for you). Pay is minimal.