Tutor
They say the best method of learning is to teach someone else, so if you fancy yourself as a little mini-teacher, why not take on the role as a summer tutor. It’ll be extremely rewarding to both you and your student, and you can always focus on the subject(s) you are particularly good at.
It won’t be long until your studies have finished and you’ll be having to work the 9-5. So however much you may dream of having a prolonged summer of debauched freedom without the ties of responsibilities, unfortunately, that just isn’t the real world. Nab yourself a little summer job and get a head start.