Avocation (noun)

1. An activity taken up in one's leisure time for pleasure or interest.
2. A hobby or pastime.

Origin:

From latin avocatio(n-), from avocare "to call away".

Examples:

1. His avocation was playing the guitar.
2. Her avocation was gardening.
3. The avocation of photography was a passion of his.
4. His avocation was a welcome distraction from his work.
5. The avocation of painting helped her relax after a long day.