OK, having shared the above here are a few suggestions for Harry & Judy and any others planning similar trips:

Take Todd's suggestion on the Penrose book, but get all 3! (Eastern GL, Western GL & Michigan). They have info, pics, directions & maps. Best $15 each that a lighthouse adventurer can buy.

In and out of Chicago could be a great start for the circle tour of Lake Michigan. There are many links in Michigan - they have a well developed tourism presence on the web.

Some sites:
Great Lakes General Info

West Michigan Travel Lighthouse Info

Now, I might try to be in Mackinaw sometime in August for either the GLLKA sponsored boat trips, the lighthouse festival or some of the other trips that are available.

If you are not going to the reunion, you might want to wait till fall and go the the big lighthouse event in Alpena in October. Of course, in September there is the Apostle Island lighthouse doo-dah, with special trips each days to lights the tour boats normaly do not stop at.

The trip up the left coast of Michigan is great, and you are never too far from a lighthouse. On the other side of the state, in the thumb, are some great lights, as well as up the entire Lake Huron coastline. The UP brings even more adventures.

Return down the right coast of Wisconsin and you are also treated to a number of great lights.

So many choices! I know others will also share some suggestions.

Dave