harmonica, recorder, fife, pennywhistle, and come to think of it, one of those mouthharp thingys would be pretty fun to play with. I would love to get my hands on one of RG'd ukes. I reckon that a mandolyn might be as easy to travel with as one of the so called "backpacking guitars". Oh yeah and dont forget about the "Zither"
Really inspiring post! I reviewed some links and visited to "list of cottage industry manufacturers" service providers. First time, I am able to land on useful and acknowledging place to get information.