I would say the main thing is it's more important to show an interest in your subject, rather than having hundreds of irrelevant extra curricular activities. It is always good to show you have a good varied set of activities and hobbies, but try to link them to your subject. For example, when I was applying for a Psychology degree, I would explain what each of my extra curricular activities taught me about psychology.
Just make sure your personal statement isn't just a list of things that you have done. Really make sure you show some reflection on your experiences, and how they link to your subject of interest.
Hope this helps,
Please let me know if you have any other questions
Adam - Uni of Kent Rep