MIT Mathematics Majors have a number of math-centric summer activities available.
- SPUR - MIT Mathematics Department Summer Program on Undergraduate Research
- There is a wide range of other "Research Experience for Undergraduates Summer Research Programs," many supported by the NSF, and of summer internships with mathematical content. See the American Mathematical Society site for a listing.
- PROMYS - work as a counselor for a high school mathematics program at BU
- UROP - Summer is also a good time to think about doing a UROP