I was waiting for that punchline, the setup was just sitting there.

definitely, that joke was up for grabs...
For me:
Girls that enjoy and feel comfortable with kids. I really want to be a dad (but I'm in NO hurry to be one

), so this is almost a must
If a girl tells me that Heavy metal is awesome and Audioslave sucks, I'll be like a kid in a candy store
Long, interesting, well informed, multi-subject talks. Nothing tells me more about the girl than a nice, long talk about anything and everything that she can discuss with solid knowledge. Those long talks that can last for hours without awkward moments. Which is why I really dislike "wind-tunnel" girls. They tend to be found in groups, which is scary...
Instrument playing (if done well), particularly cello, violin and piano.
Nature loving, outdoorsy type. I don't drink, smoke or like to dance, so night clubs are on my least liked places. I much prefer to hike, camp or be out taking nature pics. Ah, to study Biology...
(I was going to say just "kids" as my first thing that turns me on, but that would have come out
sooooo wrong....

)