Not enough extra-curricular

I’m worried that I don’t have enough extra-curricular activities on my CV.

I’m in third year at the moment at a Russell Group university, am averaging a good 2:1 so far and while I think I’m unlikely to get a first, I’m pretty sure that I’ll end up with a high 2:1. The problem is that aside from one sports club, I really don’t have very much in the way of extra-curricular. Is it worth throwing myself into more clubs? It is my final year and I don’t want my academics to suffer.