Charmed,
I know what you mean about it being almost winter.
I live in Toledo OH. (for those who don't know where that is, its practicly a suburb of Detroit).
I belong to a gym. If that is not an option, I also walk the mall, Meijer, or Wal~Mart. Of course that doesn't really help my wallet.
Try making exersize movements to your kids cd's and teach them a "new dance" this way they'll want to do it with you and you will get your exersize.