Unfortunately, the only track I know of near me is at the LHS and it is small for 1/10 scale generally even though they run 1/8 scale on it. I know there are more tracks in other cities is IA, just don't know where or how big.
Ideally, someone should have a nice big backyard capable of housing a track. And then a picknick table and some beers to round out the day. I tend to like the more informal "jsut playing around" type of racing.
And no, I'm not volunteering my yard as it is about as big as the bed of a pickup!