Pictured Rocks Boat Tours
http://www.picturedrocks.com/

From looking at the schedule, it looks like the sunset cruise is at 5:15 and costs $35.00 per adult. There is also the Regular Cruise at 10AM and the one that includes Spray Falls at 2PM. I will contact them to see if there is a group rate available, but I think we might have to have a sizable group for that.