There's a lot of things that Vin enjoys doing with her time. She's a tinkerer by nature, so a lot of her free time is spent fiddling with her meager collection of guns. But what she adores more than anything, is to read. She prefers nonfiction—history books, especially. They're hard to come by in her village, though, given that they don't exactly have access to print technology up in the trees. But on her occasional trips to the outskirts of the nearby city, she always makes a point of visiting the library and the book store, despite the somewhat suspect* nature of some of the texts she finds there.
*Urban dwellers are seen as cheats and liars by those who live in the forest, so texts that come from there, even seemingly factual ones, are deemed only dubiously truthful at best.