I'm gonna look like a big jerk?

My friends where trying to hook me up with this girl. She's really nice, but she's just not my type at all. I'm an active musician, play around a lot and meet my fair share of girls. Problem is most of the girls I meet this way are pretty promiscuous and I want a "good girl". My friends went overboard in the "good girl" area. Her idea of fun is scrabble, and mine is.. well.. not scrabble. She was totally into me though and I'm just not into her. We've hung out a few times and its always awkward and boring. What can I do to let her know without seeming like a jerk to her and my friends?