Cello...I already play violin and viola but I just don't think I could pick up cello; it's just too different.
As well, piano. I'm not sure I could pick up playing with two hands and reading music in two different keys.
And I have to agree it'd be sort of fun to play the pipes, in part because women so seldom do so. However, when it came to the Celtic Arts group I joined, I decided I'd rather learn to dance than pipe, so so much for that. <img src="/images/graemlins/smile.gif" alt="" />