Programs like Daz 3D or Poser are fun to play with.  And you can do many other things besides make pretty women on them, lol.  Maybe you'd get the impression of that if you saw the product websites.

Anyway, one cool thing you can do is make buildings and artificial worlds.  That's so much fun, as much fun as drums or guitar.  I was really shocked how much fun art it, especially coming from a guy that can't draw or paint.