Riley and Val,
I do have some suggestions based on the route you sort of laid out.
I can't help with New England much because I lived in eastern CT and haven't even been back there in years.
But, I you are museum people, hang on.....
If you get north in upper NY, in Rochester is the Strong Museum of Play. This is a great stop if you were a child once or even know anybody that was.
If you go across NY on the Southern Tier Expressway (No Tolls), then plan a stop in the Corning Glass Museum.
If you are into ships and history, the museum in Erie PA is good. There are also numerous museum ships that dot Lake Erie, but I used to rum those, so I don't tend to bother with them.
If you plan to go north to Michigan, buy fuel in Ohio or at least check it out on gas buddy.
Now, for an excursion into MI, there are two museums that should not be missed and they are both in the same place. There is the Henry Ford Museum in Dearborn (very near Detroit), and coupled with that is the Greenfield Village complex. Neither is cheap, so read about them first.
Then while still in Michigan and if you are car people. Lookup the Gilmore in Hickory Corners. It has collections that exist no where else. The Kalamazoo (a real place) has the Air Zoo that used to be a collection of Grumman Cats. It now has a lot else too. It is close to the highway.
From here, I would like to send you off the the Field and Science and Industy in Chicago. Both are very good but parking is a bear and expensive. You will have to leave the coach out of town...
Now let's see if I can post this....
Matt
Matt & Mary Colie
A sailor, his bride and their black dogs (one dear dog is waiting for us at the bridge) going to see some dry places that have Geocaches in a coach made the year we married.