Considering the Holiday Inn Southgate - Heritage Center in Detroit?
A VT member wrote the following comment about visiting Detroit:
Border Tunnel - Detroit/Windsor by freddie18
The Detroit-Windsor tunnel is an underwater tunnel between the cities of Windsor of Canada and Detroit of the United States. It is the point of international crossing that requires both countries checking of passports and vehicles who visits each of the two countries.
Passing thru the immigration formalities takes only few minutes so it is not much of a problem to cross the border. Just some piece of advice: It is now required by the US authorities to present the passport even if you are a citizen of Canada.