Working with other UX designers, developers and product managers and being able to see first hand what they do on a daily basis.
What I wish was different
The the tasks I was assigned were not tasks they just came up with so I would stay busy, I would have preferred them to be something that a paid employee would have been doing had I not been interning there.
Get the most out of your experience, ask a ton of questions even if you think they might be stupid. I was able to learn a ton by just observing and asking questions.