How many extra curricular activities should I do while in university?

Admittedly I haven't done very much in the way of extra-curricular activities (took part in Karate in School, was a student representative for a year at uni) but I haven't done anything else with myself in my life, not even a job. I am doing a very busy and difficult degree (Aeronautical Engineering) but I have huge ambitions to become an airline pilot and airlines look for people who can demonstrate leadership and teamwork skills. It has also been heightened by the fact that i am not interested in any sports, making my life more difficult.As I have never had a job, I fully intend to demonstrate these skills by taking part in extracurricular activities. I am close to joining a community fundraising group and am currently looking for voluntary jobs as well, but I would like to do more than this in my life, can anyone suggest really good activities which I can take part in to boost my CV?

What is a VPN?

VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).