What to do summer after first year?

I am just finishing my first year as a physics major and I want to have a productive summer but I don’t really know what to do. I wasn’t able to land a research position or internship as most places aren’t looking for first years. I want to set myself up and be in a good position to get coops and research positions in the future, but I don’t really know what I should work on. Does anyone have any advice or recommendations? Thank you!