Curt,
The Cedar Creek loop is almost always whooped up. Last I rode it was about a month ago, and I've seen it worse than it was.
A couple years ago, mine were the first tracks after the groomer had been through. Boy are those loops fast then!
Yes, part of the Holton loop is opened back up!! If you've ridden it before and liked it, I'd go right there first!
Have a great ride!
Next year, consider coming up for the Michigan Trail Rider Trailfest (read the thread further down). You'll really enjoy it!