I politely disagree with the previous posts.
Law school applications are more than numbers. You get a personal statement. That statement can be a huge boost to an application, and spending some time in that statement talking about taking some college level courses post graduation to show that your UGGPA is not indicative of the sort of student you would be now can be helpful.
I wouldn't enroll as a full time student, but it just can't hurt to take a class and do well, especially if it has been a while since you were in academia.
I don't disagree that GPA and LSAT scores are integral, nor do I think a retake is a bad idea. You should retake. I do think taking a course and doing well speaks volumes to an admissions board as to the type of student you can be. Applying to law school straight out of college gives you very little wiggle room on an app. Applying after you have a little real-world experience is a different story altogether.