Credit hurting my GPA?

<p>I am HS senior and I plan on attending Santa Barbara City College's Honors Program next year with the plan of transferring into Berkeley in two years. I have decided that I want to start earning credits right away so I am going to take some summer classes. But more classes like PE and Study Skills, problem is most that I have looked at are credit/no credit and I have heard that they are waited as a C or something, I am kinda new to this so will this Credit/No credit be waited as a C? And will the adcoms take that into consideration when looking at my GPA? I guess my basic question is will it at all hurt me to have a credit on my transcript as I hope to attain the elusive 4.0.(I might me applying for Haas, I am still undecided) Thanks for your time.
-Jessica</p>