When I'm feeling the blues from divorce I:

Go for a long, slow walk around the lake by my house.
Jump on the treadmill if I need to really get my head clear.
Work in my garden for hours(its huge!!!)
Read a good book.
Go shopping (only when I'm really feeling down).
And when all else fails, I put on some good 70's music and dance naked in the dark!!!! (Kidding, I dance barefoot.) Nothing like good old 70's disco music to lift the spirits!!