I just heard from my parents that they will be visiting relatives in Southeast Michigan (very close to Toledo, Ohio) the week before my wedding in June. As they will have a few days to kill before arriving for the wedding, and it's only a 5 or 6 hour drive from Southern Michigan to Pittsburgh, my mom asked if there were any interesting things to see and do along the way. Being new to the region and having not really spent anytime in that area I told her that I'd ask some people more knowledgeable than myself.
So now I turn to the Throbbing Brain and ask for any travel tips I could pass on. Are there any train rides, museums, interesting countryside, craft fairs, festivals, anything that an active couple in their early 50's would enjoy seeing?