Personally, my biggest hobby besides video games is Legos. I'm nearly 16, and I'm still a huge fan of the toy. Currently, I have over 200 kits in my collection, as well as numerous other related items (shirts, books, games, etc.). I'm also a member of three forums that deal with legos, on all of which I'm an active poster.
I also love fiddling around with all sorts of computer related programs and arts - graphic design, video game making (Gamemaker), programing, spriting, animation, rom hacking, etc. I'm not really good at any of them, and most I have basically no experience in, but I hope to put this interest to good use once I get out of high school and into college.
One more thing I really enjoy is writing - both creative and non-fiction. I'm currently working on a book length story that I'm doing bit by bit just for fun. I've also written a few letters to my local newspaper.
Besides those things, I also enjoy reading (of all types), watching a few cartoons on saturday and sunday morning, going to a local homeschooling group, hanging out with my friends, and spending time with my family. Oh, and surfing the internet, of course. :P