Fellow physics undergrad here, hoooowwwwyadoin? I'll write of some stuff I've learned is important, and I'm quite interested in other LessWronger's opinions.
I think one important thing to learn is how to understand something, and how to notice when you don't understand something. I can't tell you how many students sit at the front of the room, nod happily along with the teacher, memorize all the equations, and still have no idea what any of it MEANS. Not only that, but they don't even know that they don't know what it means. What has worked for me is to get at least 2 textbooks on every subject I study and learn with those and the teacher. Each book hits problems in a different way and has different visuals and such. Gaaah sorry that was off of your question kindof.
Learn programming on your own. It's easy and most intro to programming courses go waaaayyyy too slowly.
Statistics is very important and most intro classes won't be enough. You can learn the statistics as you do research and need it, or take advanced classes that still won't cover enough ground.
Learn how to write. Note: most English 101 style classes don't actually teach you anything. Take a more advanced essay class or two.
hoooowwwwyadoin?
off of your question kindof
Learn how to write.
how to notice when you don't understand something.
I suggest you switch to a more lucrative major so you can pay for all the irony meters you must be breaking.
To further elaborate the question: What are the most universally and most useful skills one could learn at a university? Currently, I am studying physics as an undergraduate and I am thinking about my career options. I have gotten opinions in other forums as well but I would really like to hear your thoughts and I also think that other LessWrongers would find such a list useful. To give you a rough idea of what I mean I have two examples:
What are some other skills along this line that are universally useful?