Off from Point Nipigon, in Lake Michigan, there are three shipwrecks that one can see from a kayak. I found these from my Garmin GPS at first and then I read up on them. They are the Henry Clay, Albemarle, and the J.H. Outhwaite (I believe).
They are only in 10 to 30 feet of water, so if it is a calm day it is not an issue to find them as the first two are only about 300-400 feet apart and the other is about a quarter mile from those. I suggest getting GPS coordinates.
I went twice to see these - the first time it was calm and I had my GPS - I had no problem finding the wrecks. The second time it was quite rough and I did not have my GPS - we did not see them that time.
There is one rest stop about 2 miles away and then an excellent campground, Mill Creek Campgrounds, and then Mackinaw City (about 9 miles one way though)
Find an access point along US 23 depending on how far you want to paddle. You will have to start north of the point and paddle down to it.
Book: "Shipwrecks of the Straits of Mackinaw"