Hmm... I'm not sure I have any hobbies that are typically thought of as male... I play a decent amount of video games, but I don't consider that a gendered hobby. It's just a medium, like film or music. I think the gendered aspect comes when you consider what types of games you like. For example, I'm more into story based and emotional games than shooters, racing games, etc. And I do like games with lots of customization.
I'm fairly tech savvy, and enjoy building and repairing computers/components and general electronics. I suppose that's more of a guy hobby, maybe? I'm not sure if I do it for "girly reasons." When it comes to that sort of thing, I'm not sure there are all that many reasons to do it, really. But I will say that if given the chance, I would totally build a girly pink computer or something. 😀