I like to visit other game stores, often traveling long distances to see them. It provides me an overall insight into what the industry is doing. Writing about the industry is by nature to generalize, and the more overall breadth of experience I have with stores, the better my analysis.
I am open to suggestions and other ways of doing things, but I don't visit stores looking to take anything. I'm genuinely curious. I get more out of touring stores than visiting a trade show at this point. This is a very expensive way to educate myself, so we like to combine our game store tours with things like national parks and monuments, making it a game store tour vacation of sorts.