Ask HN: Founders, how should I spend my summers while in college?

I'm a sophomore studying Business (also developing technical knowledge through extra-curricular pursuits) and I'm currently applying for biz dev and sales internships for the upcoming summer. However, as an aspiring entrepreneur, I'm not sure that an internship is the best way I could spend my time. I think that there might be something that I should do instead that I would enjoy more (not that I wouldn't enjoy working at a company I like) and that would provide me with more valuable experience. Whether it's starting my own company, freelancing, studying through MOOCs, or participating in programs like Lightspeed VC's summer fellowship, I want to know your thoughts on the decision process that I am going through.

TL;DR: if you were still in college, how would you have spent your summers?