What do you guy's do to keep your mind fresh when you have a really long break from college? read ahead, review...?
Working on campus, relaxing and studying. I don't study for the next semester but review some stuff I forgot, or learn a proof I put off during the semester, read some journals and
on an area I am interested. Where ever I fill there was a hole in my foundation, I put all the effort during the summer to relearn and understand it.