Activities and Awards - UC Application

I’m finishing my application to the UCs as a transfer student and have a couple of questions regarding the Activities and Awards section. I haven’t done a lot of extracurriculars in college and was wondering: is this section really important? Is lying or exaggerating things I’ve done (like saying I’ve done an activity longer than I actually have) a good or bad idea? I did a lot of clubs and extracurriculars in high school so are those worth mentioning or are they irrelevant at this point? Thanks.