Y2Z,
I live and Michigan and we have a lot of different trail systems. Pretty much pick your poision, we have tight knarly trails and wide open fast stuff, and a lot of terrian in between.
Depending on the time of year the trails can be wet or dry. The DNR frowns on creek/river crossing so you won't find many of those. Lot's of camping areas near trails for travelers like your self. Spend 20 bucks to join the Michigan CCC and you will have access to all the maps and info you need to have a good time.
Some of my favorite places would be Evart, Drummond Island, Sand Town. Twin Hearted River trail, ( I think thats the name). Well actually I don't think there's any I don't really like, it just depends on the time of year and the conditions.
The trails start about 45 minutes from my house, and some of them are 8+ hours away, I've never regretted a good road trip for a day or two, three, four, or more of some great riding.