string:
sigma dm4m - (so so player)
morgan monroe mandolin - (i'm rubbish, need lessons)
appalachain dulcimer - (as above)

wind?
tin whistle (recently picked up a £4 jobbie, find I have lung capacity probs)
ocarina 4 hole - (can play slowly with tune book)
harmonica (only for fun)

percussion:
shakey eggs - (only if I don't sing along)
tambour 4 inch - (as above)

piano - (when I was a kid, teen and in mid 30s when there was one about. wasn't too bad but I only played by ear. never did learn to read music properly.)