I play my guitar everyday.
It is my personal form of meditation. It relaxes me. The challenge of learning a new song keeps the mind sharp.
I believe EVERYONE should make a little music of their own everyday... even if it's just humming.
I used to play the guitar too when I was in school. Its a lot of fun playing to the famous songs and also trying to invent some new tunes. Sadly I dont play it anymore but reading this discussion is making me long for it again.