Recommend summer programs?

I’m a rising senior, and I’m a bit worried right now because I have no clear plan for my summer vacation yet. I have some things (college course, perhaps, a possible internship and some job summer courses) that I’m looking into right now, but I would also like to apply for a summer program.

Perhaps I’m intimidated by the awesome resumes of people here on CC, because I’m apprehensive about applying places. My academic stats are great - near perfect/perfect PSAT and SAT score, 4.0 GPA, rigorous course schedule, etc. but my extracurriculars in general are pretty lacking (no awards, no leadership positions really). Are there any programs out there that have applications more stats-focused, or just more academic in general?

I would prefer going for a little prestigious program, but not too difficult. I want it to be low-cost, or even free based on admission selections. Any ideas or places you guys are applying?