Thanks to everyone for all the advice and recommendations. Due to the fact that I'm traveling in July near the week of the 4th, lodging is both challenging and expensive. But I found a cute little rental cottage up near Suttons Bay for $700. So, while not quite as fun as the adventure of a tour, it seems more reasonable and simpler to organize.
I will be a couple hours from Charlevoix, 3 hours from Mackinac and 20 minutes to Sleeping Bear Dunes. I was most interested in this county anyway, though I'll be sad to exclude Pictured Rocks, the various north woods water falls and Saugatuck. Considering everything, I think it will be a fine trip and it will allow me the freedom to shoot a particular view on more than one day. I'll get the road trip in perhaps this fall for the colors where I can include Pictured Rocks and Mackinac Island.