Should I Do A Research Project This Summer Even If It Means I'll Have No Time To Enjoy Myself?

I'm a pre-dental Biology major and I've been approved to do a research project in Philosophy this summer. I've also gotten confirmation to do an internship with an oral surgeon, which I definitely definitely want to do because it's super relevant to my goals. I'm second guessing whether the Philosophy project is worth it, since it's not too relevant to my goals and it's gonna be A LOT of work. I'm starting to think I'd rather just blow it off and enjoy my summer. I've worked so hard this school year and I really feel like I need a break. The research + internship would be SO much, not impossible but a lot. The downside is that I think the research project will be impressive to Dental Schools, which why I wanted to do it in the first place. So it's between breaking my back and possibly having a miserable summer in order to impress dental schools, or saying **** it and having a more enjoyable summer. What should I do?