I can also recomend the yankee air museum at willow run the B24 history is well worth the visit , but one photo sums up the USA,s major contribution to WW2 it shows the trafic jam on the I 94 as the ford workers turned up for work , at this time a european worker was lucky to own a push bike.
I think it was Winston Churchill who said of WW2 that the britsh provided the time the USSR provided the blood and the USA provided the cash,enyhow the museum gives a good insight of how the USA,s economic might was used in tht cause of freedom in WW2.
The best aircraft they have is the B17 that they have rebuilt from the ground up ,i was lucky enough to see its first flight after a 5 years of work .....just wonderfull.
For refreshment in the detroit metro area i can recomend the Wheat and rye bar its cheap and chearfull and dont order eny food in a large size or you will be eating all week !
the bar is located near all the major hotels at metro.