Look into taking some summer classes at the Duke Marine lab and then email some of the people doing research there. My S did that after sophomore year since he did not get any internships. (I don’t recall who he did the research with.) Anyway that was a short summer of research and classes but it set him up for next summer internship at Mote Marine lab.
Of course apply to lots of places but any experience that can be gained from exposing one to other nontraditional jobs/classes will help the resume when applying for those choice internships.