I'm not sure. I think guitar is a good idea, because not much equipment is essential - there are a lot of options equipment-wise, but only a guitar, amp (if electric) and plectrums for some styles are really necessary to start with. So it can be quite simple, but has potential to be really varied and specialised depending on the type of music you want to play, or use of other things like effects pedals, different amps, capos, slides, different string and plectrum types, and a bunch of other things. Maybe it's just because I like music though.
All of your ideas sound interesting, I guess only you can decide as interests are really individual things.
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Blackbird singing in the dead of night, take these broken wings and learn to fly...