Michigan has one of the world's few "dark sky" parks for sky gazers, Headlands International Dark Sky Park. The Headlands is the seventh International Dark Sky Park in the United States and just the in the world.
Kayaking along Pictured Rocks National Lakeshore, Upper Peninsula, Michigan. I did this for vacation last year. It's an eight hour day trip along the Pictured Rocks. Breath taking and well worth the money you spend on the experience!