First of all, we need to make it clear that all the functions of a resume are to get you an interview opportunity through screening. You can write the following points:

Volunteer activities are suggested to be done more often in college life, whether for utilitarian purposes or dedication. This can be filled in your resume, which can improve HR's impression of you.

Part-time experience, there may be some part-time experience before internship. Write it down and list what value you created and what you learned from your part-time job (HR will definitely ask this question). Having a part-time job experience at least proves that you have a rough contact with society, and most college students are engaged in low-level service jobs, so at least you can give people the impression that you can bear hardships and work.

Off-campus activities can basically be written, such as going out for research (preferably done independently), such as organizing summer camp activities. Because off-campus activities are basically carried out independently and usually require certain ability, off-campus activities can generally add a lot of color to your resume.