I have been mulling over the idea of taking up two new hobbies. I have wanted to learn some new things as well, and want to do this with my wife. I already do a fair number of hobbies (fishing and hunting for example (although I have let hunting go by the wayside somewhat)).
Two things that interest me, that my wife seems to be on board about trying are a) learning to play the guitar, and b) working at watercolor painting. As I am fairly musically inclined already (I play clarinet and saxaphone), the learning curve in regards to reading music will be absent for me. But, I have never really focused much on playing a string instrument before, so the steep learning curve will be the actual physical playing of the guitar. My wife knows basic chords on the guitar, but does not know how to read music. Hopefully the combination of knowledge we have will allow use to help each other out as we practice.
As for the painting of watercolors, my wife and I both thought it would be interesting to try. If I had my druthers, I would like to paint architectural scenes like the one above by Eugen Chisnicean. I think his work is excellent!