Pleading "no contest" would get you what? The court would treat it as a guilty plea.

What you should do is consult a lawyer to see if you are eligible for first offender sentencing, which might let you avoid a conviction.

With drugs and paraphernalia in various locations in the interior of your car, I doubt that you would be able to convince a jury both that none of it was yours, and that you had no idea that it was there.