This sounds like a great time for sure. All 3 parks are great. Bundy Hill, Rocks and Valleys and Twisted Trails. Not sure if I can make all three, but I'm gonna try.
I'll try and post some pictures myself of my adventures at these parks.
The Blessing is a pretty amazing grouping of Jeeps and "other" welcomed 4x4's. I missed last year, but I made it in 2009 and I think there were close to 1000 (yes, one thousand) jeeps in the parade.
The 3 courses at the Blessing are pretty fun too, depending on the capability of your rig.
All the parks have trails for all levels of rigs !!
x2. Most of the pics I posted are of pretty heavily modified rigs, but like rederaa said, there are trails for ALL LEVELS OF RIGS.
Bundy Hill is basically are working gravel pit with lots of hill climbs (think Silver Lake but a little more grainy) They also have quite a few trails, (two tracks) through the woods and a few mud holes.
Rocks and Valleys is a great representation of northern Michigan with a lot of trails cut right through the woods and modified with a bulldozer to make them interesting. There are a lot of tight, twisty two tracks and there are trails with logs and trees and some that have rocks. There are also a couple of fun hill climbs and a mud play area.
Twisted Trails is full of trails and mud holes galore. Stock vehicles can have as much fun as they want as well as heavily modified vehicles will be challenged.