The most famous Detroit BBQ place. Patrick and Grace have found that in recent years, not every cook delivers the same delicious plates, but if you want to go somewhere iconic - this is the place!
Patrick & Grace's favorite date place. Go see Diego Rivera's famous Detroit Industry Murals!
Henry Ford collected many important historic vehicles including the bus on which Rosa Parks refused to give up her seat and the limousine that JFK sat in on that fateful day. There are also a lot of interesting old farm machines, trains, other U.S. Presidents' cars, and always some interesting design exhibit. For all you math nerds, there is a Mathematica Exhibit which has cool ways of explaining normal distribution and geometric principles.
Where Patrick and Grace go after church for walks. Enjoy the beautiful water, and you can see Canada across the way.
If you have small kids and are at the Detroit Riverwalk, consider taking them to this interactive installation.
If you have the whole weekend off, Niagara Falls is a 4 hour drive away. Bring your passport so you can cross the bridge and get into Canada to see the American Falls from the Canadian side.