We're goind to ride White Cloud instead of Little "O", mainly to keep down the extra drive. I'm starting on a new "Toy Barn" on Monday, and will be meeting the excavator Sunday night.
White Cloud is shaped like a lollipop. The trailhead is both MCCCT and ORV, then has a short loop on it. I used to like the trail because it had a lot of real dirt (vs. sand), but it's gotten more popular in the last couple years as a quick jaunt from Grand Rapids. Last time I rode it was last year, and I wasn't impressed. Hopefully it's gotten a little better.
I personally like Little "O". I've seen some 4-wheel traffic on it, but not much. There's some whoop sections, some sand, but also some fast twisties. I think it's 39 miles, not the 28. Seems to me it was further than that even, but I haven't ridden it in over a year.
If you go, park at the lot off of 32nd street, not the one off of M-37. Definately less traffic, and it puts you right on the loop.