You have more disposable time now than you will again for quite a while. Don't waste it all.

The marginal cost of an additional class in college is entirely in time (see above).

Study languages more. Do not stop with the minimum requirements for your degree, continue on to at least sound reading proficiency.

Take more math classes.

That VDT with a blinking cursor? Learn something about it. Computers are more usable when you can get away from punch cards.