I like programming, electronics, reading, maths and am getting a bike this week so I can spend more time outside! I love talking about these things with other people, and from what I can gather from their body language and facial expressions they also enjoy hearing what I have to say about my interest. But I also enjoy letting them talk about what they like to do so I can get to know them!
Maybe also try hiking as more people are into it, plus more opportunity to chat compared to biking. Look for hiking groups in your college. There will be bikers in that group too.
Also, any activity where you see the same people on a regular basis so they get to know you is great.
