What should I do during my summer vacation?

I don’t feel like getting a job, but I’m visiting a few colleges. Any ideas?

It’s good that you are visiting colleges this summer.

Reconsider a job. It’s great experience, the money comes in handy, and it will look good on the common app.

I think a job would be good! You’ll get references, save money for college/the future, and receive experience.
If you can’t find/don’t want a job, you could always volunteer. Volunteering can be beneficial on applications, especially if your experience is related to your major.