There's nothing wrong with getting a traditional summer job. I bussed tables, worked at a paperweight shop, and taught seniors how to use computers at my local library back in the day.
But if you are still looking for something to do this summer and you want to build up evidence to support your major (hint: that's a way to strengthen your applications!), then take a look at some of my suggestions. I have listed some popular majors and summer experience options that support them.
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Swimming pool service technician, working in the lab of a makeup company
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For those students interested in other majors, one of the most generous providers of summer experiences is your town offices or community venues. Look at local museums, public parks, public offices, libraries, and colleges nearby. You will be surprised how eager and appreciative these places are for ambitious students like yourself.