What do you wish you did the summer before college

People who are currently in college, what are things you wish you did in your free time or before going to college. I want to be a computer science major, so for other computer science majors, what are things you have done, or wish you did, that really sets you apart in your field. I want advice so that I don’t regret not doing everything I could when I had the chance.

My D wishes she would have travelled more!

Enjoy your summer!

There is no need to do anything to prepare.

Get a job and save your money for spending at college.
Have fun with your HS friends.
Spend time with your family.
Do (safe) activities.
Travel (when safe).