[pairing]

How about taking an online course this summer instead of an internship (Coursera's machine learning would probably be a very big project depending on your current level of math or the MIT SICP lectures & book to start learning CS/functional programming)?

The path to mastery is mostly self learning in my limited experience in software so far, so the earlier you learn that and build the skills to learn on your own the better off you will be. Learning on your own without a teacher, grades, mentor, or internship will prepare you more for the real world than most college students.