Boss wants me to get an intern

Short and sweet.

My boss, the CEO wants me to have an intern so I can focus on strategy more for the summer and leave some of the day-to-day work to the intern.

I am the only marketing presence in a small but international B2B manufacturer and he wants me to assign he/she things to do.

Any advice from experience with this on what to assign an intern that will be least interruptive and can maximize their time (20 hours a week)?