I like to go for long walks in the countryside. And I mean hours at a time. But you have to live near countryside to be able to do that.
I also used to build airfix models. I had to stop when prices started going up though, but that was a few years ago now. Some bits can be very fiddly but I still enjoyed it.
I learn programming when I was younger. I made an Android app which makes me a tidy sum each month
Right now, though, I'm more into producing electronic music.
I do programming as well, although not Android (I did try it my computer was to slow to simulate the software lmao). I do some not so legal reverse engineering stuff
I have no hobbies besides school and getting angry with inanimate objects.
My life is so pathetic...
You could do the typical TSR thing and either read some educational books, or do something 'helpful' in the community. Or lie about doing so in your personal statement...