The Canadian side is much nicer than the American side in my opinion. We have never had any problems with customs or our TT.
We like the campgrounds in the eastern side of Kentucky better than the western side. There is a big National Forest with several campgrounds with electricity and water.
I would wait until your son is a little older to go thru Mammouth Cave so you can do something more than the simplest walk.
I love this forum! So many good tips. We do all have passports. I will definitely check Eastern Kentucky, particularly the cave and what a five yr old can do. The tips on Wisconsin Dells and Virginia Beach.
Several of the sites you list are close to your home state that you could visit on a week long trip. With that much time, I might suggest going further west to Mt Rushmore, Yellowstone, Grand Teton National Parks, etc.
Are you heading from Chicago to KY via Illinois or Indiana? If Illinois, I would suggest one of the many CG's on Rend Lake. It's an 18,000 acre reservoir with one state park CG and five COE's plus some private. It sits right off of I64 and offers hundreds of campsites.
You have some good suggestions already for the rest of the trip. I would urge more time in Williamsburg and a little less in the UP, plus consider the Canadian side of the falls - more choices to camp and more to see. Not that you should not see the American side too.
Upper Michigan? If you are talking just about the U.P., there's a lot more to it than the Mackinac area.
Sault Ste Marie has locks to see operating, and museums about the history of lake transportation. My kids liked the shipwreck museum particularly.
I can spend weeks climbing around on the rocks in Marquette
County, going to the beaches, hiking in the woods. There are iron mining history museums in that area, and museums to the sport of ski jumping.
Alger County, out of Munising, there is the Pictured Rocks National Lakeshore. Near Newberry, Tahquamenon Falls.
Houghton and Keweenaw counties are in copper mining country, with museums, the Tech university, and old mines to visit.
US-2 from Iron Mountain to Bessemer runs through another important iron mining region, with a history to tell you.
If you are asking also about the upper Lower Peninsula, this is "go to the lake for the summer" country: the whole Lake Michigan coast, and hundreds of inland lakes and recreational rivers among the forests from a line connecting Grand Haven to Standish, north to St Ignace. Outdoor summer vacation country for people from the farmlands and industrial cities of lower Michigan and surrounding states.
In Wisconsin, Baraboo has a unique rock formation wrapped around Devil's Lake (most visitors see it as just something to climb) the Circus World museum, a railway museum and a UFO museum.
For Niagara at least walk the rainbow bridge over to canada to look at the falls....much better view. Lots more to do also. 5 yo probably love the imax theater. Careful going through buffalo. Kind of a pain.
"Niagara Falls and Toronto- 4 days campground info and time alloted pretty good for area? We want to stay on the US side just because of camper and customs etc"
Its a bit of a drive from Niagra Falls to Toronto. Have you thought about the Toronto zoo, Canadas wonderland, CN tower, African Lion Safarii and Niagra on the Lake - just to name a few great places for families to enjoy.